TLJH Signup and login customizations not working

Having few issues with login and signup custom pages not displaying after enabling Native Authentication - jupyterhub/nativeauthenticator#69 suggestions do not seem to work for me and having trouble figuring out what the issues are.

Ran pytest ad getting 2 error and 2 warning messages. Also not sure if these errors are related to the issue or not.

```
platform linux -- Python 3.7.6, pytest-5.3.5, py-1.8.1, pluggy-0.13.1
rootdir: /opt/tljh/nativeauthenticator
plugins: asyncio-0.10.0
collected 27 items

nativeauthenticator/tests/test_authenticator.py ...................FF.. [ 85%]
nativeauthenticator/tests/test_orm.py .... [100%]

================================================================================================ FAILURES =================================================================================================
_____________________________________________________________________________ test_import_from_firstuse_dont_delete_db_after ______________________________________________________________________________

tmpcwd = None, app =

async def test_import_from_firstuse_dont_delete_db_after(tmpcwd, app):
with dbm.open('passwords.dbm', 'c', 0o600) as db:
db['user1'] = 'password'

auth = NativeAuthenticator(db=app.db)
auth.add_data_from_firstuse()

files = os.listdir()
assert UserInfo.find(app.db, 'user1')

assert ('passwords.dbm' in files) or ('passwords.dbm.db' in files)

E AssertionError: assert ('passwords.dbm' in ['passwords.dbm.dat', 'passwords.dbm.dir', 'jupyterhub.sqlite', 'passwords.dbm.bak'] or 'passwords.dbm.db' in ['passwords.dbm.dat', 'passwords.dbm.dir', 'jupyterhub.sqlite', 'passwords.dbm.bak'])

/opt/tljh/nativeauthenticator/nativeauthenticator/tests/test_authenticator.py:182: AssertionError
------------------------------------------------------------------------------------------ Captured stderr setup ------------------------------------------------------------------------------------------
[I 2020-02-17 18:30:31.724 alembic.runtime.migration migration:154] Context impl SQLiteImpl.
[I 2020-02-17 18:30:31.725 alembic.runtime.migration migration:161] Will assume non-transactional DDL.
[I 2020-02-17 18:30:31.742 alembic.runtime.migration migration:513] Running stamp_revision -> 4dc2d5a8c53c
________________________________________________________________________________ test_import_from_firstuse_delete_db_after ________________________________________________________________________________

tmpcwd = None, app =

async def test_import_from_firstuse_delete_db_after(tmpcwd, app):
with dbm.open('passwords.dbm', 'c', 0o600) as db:
db['user1'] = 'password'

auth = NativeAuthenticator(db=app.db)
auth.delete_firstuse_db_after_import = True

auth.add_data_from_firstuse()

/opt/tljh/nativeauthenticator/nativeauthenticator/tests/test_authenticator.py:192:

/opt/tljh/nativeauthenticator/nativeauthenticator/nativeauthenticator.py:246: in add_data_from_firstuse
self.delete_dbm_db()

self =

def delete_dbm_db(self):
db_path = Path(self.firstuse_db_path)
db_dir = db_path.cwd()
db_name = db_path.name
db_complete_path = str(db_path.absolute())

# necessary for BSD implementation of dbm lib
if db_name + '.db' in os.listdir(db_dir):
os.remove(db_complete_path + '.db')
else:

os.remove(db_complete_path)

E FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pytest-of-root/pytest-3/test_import_from_firstuse_dele0/passwords.dbm'

/opt/tljh/nativeauthenticator/nativeauthenticator/nativeauthenticator.py:232: FileNotFoundError
------------------------------------------------------------------------------------------ Captured stderr setup ------------------------------------------------------------------------------------------
[I 2020-02-17 18:30:32.429 alembic.runtime.migration migration:154] Context impl SQLiteImpl.
[I 2020-02-17 18:30:32.429 alembic.runtime.migration migration:161] Will assume non-transactional DDL.
[I 2020-02-17 18:30:32.446 alembic.runtime.migration migration:513] Running stamp_revision -> 4dc2d5a8c53c
============================================================================================ warnings summary =============================================================================================
nativeauthenticator/nativeauthenticator.py:23
/opt/tljh/nativeauthenticator/nativeauthenticator/nativeauthenticator.py:23: DeprecationWarning: metadata {'default': False} was set from the constructor. With traitlets 4.1, metadata should be set using the .tag() method, e.g., Int().tag(key1='value1', key2='value2')
help=("Creates a verification of password strength "

/opt/tljh/user/lib/python3.7/site-packages/notebook/notebookapp.py:47
/opt/tljh/user/lib/python3.7/site-packages/notebook/notebookapp.py:47: DeprecationWarning: zmq.eventloop.ioloop is deprecated in pyzmq 17. pyzmq now works with default tornado and asyncio eventloops.
ioloop.install()

-- Docs: https://docs.pytest.org/en/latest/warnings.html
================================================================================ 2 failed, 25 passed, 2 warnings in 29.47s ================================================================================
```