Document the upgrade procedure

### Solution to issue cannot be found in the documentation.

- [X] I checked the documentation.

### Issue

I've previously installed mambaforge using the Mambaforge-4.13.0-1-Windows-x86_64.exe installer (double-clicking the exe). Tried Mambaforge-23.1.0-0-Windows-x86_64.exe the same way and it gives alert:

> Directory 'C:\Users\USERNAME\AppData\Local\mambaforge' is not empty,
> please choose a different location.

I've run `Mambaforge-23.1.0-0-Windows-x86_64.exe /?` at a command prompt to list its arguments and it appears there is no upgrade switch.

It would help to include an option for upgrading mambaforge to a newer version, and/or to provide guidance in how to do this in a way that retains existing environments.

### Installed packages

```shell
(base) C:\>conda list
# packages in environment at C:\Users\\AppData\Local\mambaforge:
#
# Name Version Build Channel
anyio 3.6.2 pyhd8ed1ab_0 conda-forge
appdirs 1.4.4 pyh9f0ad1d_0 conda-forge
argon2-cffi 21.3.0 pyhd8ed1ab_0 conda-forge
argon2-cffi-bindings 21.2.0 py39ha55989b_3 conda-forge
asttokens 2.2.1 pyhd8ed1ab_0 conda-forge
attrs 22.2.0 pyh71513ae_0 conda-forge
backcall 0.2.0 pyh9f0ad1d_0 conda-forge
backports 1.0 pyhd8ed1ab_3 conda-forge
backports.functools_lru_cache 1.6.4 pyhd8ed1ab_0 conda-forge
beautifulsoup4 4.11.2 pyha770c72_0 conda-forge
bleach 6.0.0 pyhd8ed1ab_0 conda-forge
brotli 1.0.9 hcfcfb64_8 conda-forge
brotli-bin 1.0.9 hcfcfb64_8 conda-forge
brotlipy 0.7.0 py39hb82d6ee_1004 conda-forge
bzip2 1.0.8 h8ffe710_4 conda-forge
ca-certificates 2022.12.7 h5b45459_0 conda-forge
certifi 2022.12.7 pyhd8ed1ab_0 conda-forge
cffi 1.15.1 py39h0878f49_0 conda-forge
charset-normalizer 2.1.1 pyhd8ed1ab_0 conda-forge
colorama 0.4.5 pyhd8ed1ab_0 conda-forge
comm 0.1.2 pyhd8ed1ab_0 conda-forge
conda 4.14.0 py39hcbf5309_0 conda-forge
conda-package-handling 1.8.1 py39hb3671d1_1 conda-forge
contourpy 1.0.7 py39h1f6ef14_0 conda-forge
cryptography 39.0.1 py39hb6bd5e6_0 conda-forge
cycler 0.11.0 pyhd8ed1ab_0 conda-forge
debugpy 1.6.6 py39h99910a6_0 conda-forge
decorator 5.1.1 pyhd8ed1ab_0 conda-forge
defusedxml 0.7.1 pyhd8ed1ab_0 conda-forge
entrypoints 0.4 pyhd8ed1ab_0 conda-forge
executing 1.2.0 pyhd8ed1ab_0 conda-forge
flit-core 3.8.0 pyhd8ed1ab_0 conda-forge
fmt 9.1.0 h181d51b_0 conda-forge
fonttools 4.38.0 py39ha55989b_1 conda-forge
freetype 2.12.1 h546665d_1 conda-forge
gettext 0.21.1 h5728263_0 conda-forge
glib 2.74.1 h12be248_1 conda-forge
glib-tools 2.74.1 h12be248_1 conda-forge
gst-plugins-base 1.22.0 h001b923_0 conda-forge
gstreamer 1.22.0 h6b5321d_0 conda-forge
icu 70.1 h0e60522_0 conda-forge
idna 3.3 pyhd8ed1ab_0 conda-forge
importlib-metadata 6.0.0 pyha770c72_0 conda-forge
importlib_metadata 6.0.0 hd8ed1ab_0 conda-forge
importlib_resources 5.10.2 pyhd8ed1ab_0 conda-forge
intel-openmp 2023.0.0 h57928b3_25922 conda-forge
ipykernel 6.21.1 pyh025b116_0 conda-forge
ipython 8.10.0 pyh08f2357_0 conda-forge
ipython_genutils 0.2.0 py_1 conda-forge
ipywidgets 8.0.4 pyhd8ed1ab_0 conda-forge
jedi 0.18.2 pyhd8ed1ab_0 conda-forge
jinja2 3.1.2 pyhd8ed1ab_1 conda-forge
jpeg 9e hcfcfb64_3 conda-forge
jsonschema 4.17.3 pyhd8ed1ab_0 conda-forge
jupyter 1.0.0 py39hcbf5309_8 conda-forge
jupyter_client 8.0.2 pyhd8ed1ab_0 conda-forge
jupyter_console 6.4.4 pyhd8ed1ab_0 conda-forge
jupyter_core 5.2.0 py39hcbf5309_0 conda-forge
jupyter_events 0.6.3 pyhd8ed1ab_0 conda-forge
jupyter_server 2.2.1 pyhd8ed1ab_0 conda-forge
jupyter_server_terminals 0.4.4 pyhd8ed1ab_1 conda-forge
jupyterlab_pygments 0.2.2 pyhd8ed1ab_0 conda-forge
jupyterlab_widgets 3.0.5 pyhd8ed1ab_0 conda-forge
kiwisolver 1.4.4 py39h1f6ef14_1 conda-forge
krb5 1.20.1 heb0366b_0 conda-forge
lcms2 2.14 ha5c8aab_1 conda-forge
lerc 4.0.0 h63175ca_0 conda-forge
libarchive 3.6.2 h27c7867_0 conda-forge
libblas 3.9.0 16_win64_mkl conda-forge
libbrotlicommon 1.0.9 hcfcfb64_8 conda-forge
libbrotlidec 1.0.9 hcfcfb64_8 conda-forge
libbrotlienc 1.0.9 hcfcfb64_8 conda-forge
libcblas 3.9.0 16_win64_mkl conda-forge
libclang 15.0.7 default_h77d9078_1 conda-forge
libclang13 15.0.7 default_h77d9078_1 conda-forge
libcurl 7.87.0 h68f0423_0 conda-forge
libdeflate 1.17 hcfcfb64_0 conda-forge
libffi 3.4.2 h8ffe710_5 conda-forge
libglib 2.74.1 he8f3873_1 conda-forge
libhwloc 2.8.0 h039e092_1 conda-forge
libiconv 1.17 h8ffe710_0 conda-forge
liblapack 3.9.0 16_win64_mkl conda-forge
libmamba 1.3.1 h8a7d157_1 conda-forge
libmambapy 1.3.1 py39h608c70e_1 conda-forge
libogg 1.3.4 h8ffe710_1 conda-forge
libpng 1.6.39 h19919ed_0 conda-forge
libsodium 1.0.18 h8d14728_1 conda-forge
libsolv 0.7.23 h12be248_0 conda-forge
libsqlite 3.40.0 hcfcfb64_0 conda-forge
libssh2 1.10.0 h9a1e1f7_3 conda-forge
libtiff 4.5.0 hf8721a0_2 conda-forge
libvorbis 1.3.7 h0e60522_0 conda-forge
libwebp-base 1.2.4 h8ffe710_0 conda-forge
libxcb 1.13 hcd874cb_1004 conda-forge
libxml2 2.10.3 hc3477c8_0 conda-forge
libzlib 1.2.13 hcfcfb64_4 conda-forge
lz4-c 1.9.3 h8ffe710_1 conda-forge
lzo 2.10 he774522_1000 conda-forge
m2w64-gcc-libgfortran 5.3.0 6 conda-forge
m2w64-gcc-libs 5.3.0 7 conda-forge
m2w64-gcc-libs-core 5.3.0 7 conda-forge
m2w64-gmp 6.1.0 2 conda-forge
m2w64-libwinpthread-git 5.0.0.4634.697f757 2 conda-forge
mamba 1.3.1 py39hca8391b_1 conda-forge
markupsafe 2.1.2 py39ha55989b_0 conda-forge
matplotlib 3.6.3 py39hcbf5309_0 conda-forge
matplotlib-base 3.6.3 py39haf65ace_0 conda-forge
matplotlib-inline 0.1.6 pyhd8ed1ab_0 conda-forge
menuinst 1.4.19 py39hcbf5309_0 conda-forge
miniforge_console_shortcut 1.0 h57928b3_0 conda-forge
mistune 2.0.5 pyhd8ed1ab_0 conda-forge
mkl 2022.1.0 h6a75c08_874 conda-forge
msys2-conda-epoch 20160418 1 conda-forge
munkres 1.1.4 pyh9f0ad1d_0 conda-forge
nbclassic 0.5.1 pyhd8ed1ab_0 conda-forge
nbclient 0.7.2 pyhd8ed1ab_0 conda-forge
nbconvert 7.2.9 pyhd8ed1ab_0 conda-forge
nbconvert-core 7.2.9 pyhd8ed1ab_0 conda-forge
nbconvert-pandoc 7.2.9 pyhd8ed1ab_0 conda-forge
nbformat 5.7.3 pyhd8ed1ab_0 conda-forge
nest-asyncio 1.5.6 pyhd8ed1ab_0 conda-forge
notebook 6.5.2 pyha770c72_1 conda-forge
notebook-shim 0.2.2 pyhd8ed1ab_0 conda-forge
numpy 1.24.2 py39h16ffa76_0 conda-forge
openjpeg 2.5.0 ha2aaf27_2 conda-forge
openssl 3.0.8 hcfcfb64_0 conda-forge
packaging 23.0 pyhd8ed1ab_0 conda-forge
pandas 1.5.3 py39h2ba5b7c_0 conda-forge
pandoc 2.19.2 h57928b3_1 conda-forge
pandocfilters 1.5.0 pyhd8ed1ab_0 conda-forge
parso 0.8.3 pyhd8ed1ab_0 conda-forge
patsy 0.5.3 pyhd8ed1ab_0 conda-forge
pcre2 10.40 h17e33f8_0 conda-forge
pickleshare 0.7.5 py_1003 conda-forge
pillow 9.4.0 py39hcebd2be_1 conda-forge
pip 22.2.1 pyhd8ed1ab_0 conda-forge
pkgutil-resolve-name 1.3.10 pyhd8ed1ab_0 conda-forge
platformdirs 3.0.0 pyhd8ed1ab_0 conda-forge
ply 3.11 py_1 conda-forge
pooch 1.6.0 pyhd8ed1ab_0 conda-forge
prometheus_client 0.16.0 pyhd8ed1ab_0 conda-forge
prompt-toolkit 3.0.36 pyha770c72_0 conda-forge
prompt_toolkit 3.0.36 hd8ed1ab_0 conda-forge
psutil 5.9.4 py39ha55989b_0 conda-forge
pthread-stubs 0.4 hcd874cb_1001 conda-forge
pthreads-win32 2.9.1 hfa6e2cd_3 conda-forge
pure_eval 0.2.2 pyhd8ed1ab_0 conda-forge
pybind11-abi 4 hd8ed1ab_3 conda-forge
pycosat 0.6.3 py39hb82d6ee_1010 conda-forge
pycountry 22.3.5 pyhd8ed1ab_0 conda-forge
pycparser 2.21 pyhd8ed1ab_0 conda-forge
pygments 2.14.0 pyhd8ed1ab_0 conda-forge
pyopenssl 22.0.0 pyhd8ed1ab_0 conda-forge
pyparsing 3.0.9 pyhd8ed1ab_0 conda-forge
pyqt 5.15.7 py39hb77abff_3 conda-forge
pyqt5-sip 12.11.0 py39h99910a6_3 conda-forge
pyrsistent 0.19.3 py39ha55989b_0 conda-forge
pysocks 1.7.1 pyh0701188_6 conda-forge
python 3.9.16 h4de0772_0_cpython conda-forge
python-dateutil 2.8.2 pyhd8ed1ab_0 conda-forge
python-fastjsonschema 2.16.2 pyhd8ed1ab_0 conda-forge
python-json-logger 2.0.4 pyhd8ed1ab_0 conda-forge
python_abi 3.9 2_cp39 conda-forge
pytz 2022.7.1 pyhd8ed1ab_0 conda-forge
pywin32 304 py39h99910a6_2 conda-forge
pywinpty 2.0.10 py39h99910a6_0 conda-forge
pyyaml 6.0 py39ha55989b_5 conda-forge
pyzmq 25.0.0 py39hea35a22_0 conda-forge
qt-main 5.15.8 h720456b_6 conda-forge
qtconsole 5.4.0 pyhd8ed1ab_0 conda-forge
qtconsole-base 5.4.0 pyha770c72_0 conda-forge
qtpy 2.3.0 pyhd8ed1ab_0 conda-forge
reproc 14.2.3 h8ffe710_0 conda-forge
reproc-cpp 14.2.3 h0e60522_0 conda-forge
requests 2.28.1 pyhd8ed1ab_1 conda-forge
rfc3339-validator 0.1.4 pyhd8ed1ab_0 conda-forge
rfc3986-validator 0.1.1 pyh9f0ad1d_0 conda-forge
ruamel_yaml 0.15.80 py39hb82d6ee_1007 conda-forge
scipy 1.10.0 py39hfbf2dce_2 conda-forge
seaborn 0.12.2 hd8ed1ab_0 conda-forge
seaborn-base 0.12.2 pyhd8ed1ab_0 conda-forge
send2trash 1.8.0 pyhd8ed1ab_0 conda-forge
setuptools 65.3.0 pyhd8ed1ab_1 conda-forge
sip 6.7.7 py39h99910a6_0 conda-forge
six 1.16.0 pyh6c4a22f_0 conda-forge
sniffio 1.3.0 pyhd8ed1ab_0 conda-forge
soupsieve 2.3.2.post1 pyhd8ed1ab_0 conda-forge
sqlite 3.40.0 hcfcfb64_0 conda-forge
squarify 0.4.3 py_0 conda-forge
stack_data 0.6.2 pyhd8ed1ab_0 conda-forge
statsmodels 0.13.5 py39hc266a54_2 conda-forge
tbb 2021.7.0 h91493d7_1 conda-forge
terminado 0.17.0 pyh08f2357_0 conda-forge
tinycss2 1.2.1 pyhd8ed1ab_0 conda-forge
tk 8.6.12 h8ffe710_0 conda-forge
toml 0.10.2 pyhd8ed1ab_0 conda-forge
toolz 0.12.0 pyhd8ed1ab_0 conda-forge
tornado 6.2 py39ha55989b_1 conda-forge
tqdm 4.64.0 pyhd8ed1ab_0 conda-forge
traitlets 5.9.0 pyhd8ed1ab_0 conda-forge
typing-extensions 4.4.0 hd8ed1ab_0 conda-forge
typing_extensions 4.4.0 pyha770c72_0 conda-forge
tzdata 2022c h191b570_0 conda-forge
ucrt 10.0.20348.0 h57928b3_0 conda-forge
unicodedata2 15.0.0 py39ha55989b_0 conda-forge
urllib3 1.26.11 pyhd8ed1ab_0 conda-forge
vc 14.2 hb210afc_7 conda-forge
vs2015_runtime 14.29.30139 h890b9b1_7 conda-forge
wcwidth 0.2.6 pyhd8ed1ab_0 conda-forge
webencodings 0.5.1 py_1 conda-forge
websocket-client 1.5.1 pyhd8ed1ab_0 conda-forge
wheel 0.37.1 pyhd8ed1ab_0 conda-forge
widgetsnbextension 4.0.5 pyhd8ed1ab_0 conda-forge
win_inet_pton 1.1.0 py39hcbf5309_4 conda-forge
winpty 0.4.3 4 conda-forge
xorg-libxau 1.0.9 hcd874cb_0 conda-forge
xorg-libxdmcp 1.1.3 hcd874cb_0 conda-forge
xz 5.2.6 h8d14728_0 conda-forge
yaml 0.2.5 h8ffe710_2 conda-forge
yaml-cpp 0.7.0 h0e60522_1 conda-forge
zeromq 4.3.4 h0e60522_1 conda-forge
zipp 3.13.0 pyhd8ed1ab_0 conda-forge
zstd 1.5.2 h7755175_4 conda-forge

(base) C:\>
```

### Environment info

```shell
(base) C:\>conda info

active environment : base
active env location : C:\Users\\AppData\Local\mambaforge
shell level : 1
user config file : C:\Users\\.condarc
populated config files : C:\Users\\AppData\Local\mambaforge\.condarc
conda version : 4.14.0
conda-build version : not installed
python version : 3.9.16.final.0
virtual packages : __win=0=0
__archspec=1=x86_64
base environment : C:\Users\\AppData\Local\mambaforge (writable)
conda av data dir : C:\Users\\AppData\Local\mambaforge\etc\conda
conda av metadata url : None
channel URLs : https://conda.anaconda.org/conda-forge/win-64
https://conda.anaconda.org/conda-forge/noarch
package cache : C:\Users\\AppData\Local\mambaforge\pkgs
C:\Users\\.conda\pkgs
C:\Users\\AppData\Local\conda\conda\pkgs
envs directories : C:\Users\\AppData\Local\mambaforge\envs
C:\Users\\.conda\envs
C:\Users\\AppData\Local\conda\conda\envs
platform : win-64
user-agent : conda/4.14.0 requests/2.28.1 CPython/3.9.16 Windows/10 Windows/10.0.19045
administrator : False
netrc file : None
offline mode : False
```