Add example of data filtering to Logging docs

This issue was moved from the AMDC-Firmware repo: https://github.com/Severson-Group/AMDC-Firmware/issues/144

Per @Nick-Hemenway

You can VERY easily filter data in python pandas as follows:

First, create a filtering function:

# If the window length is 21, it will fit 10 data points to each side of the data point that is being smoothed
from scipy import signal
my_filter = lambda x: signal.savgol_filter(x, window_length = 21, polyorder = 2)

Then, to use the filter:

TODO

Since this is so easy and could be a very common thing to do when logging data, add a section to the Logging markdown docs with the above information.

Find the Logging markdown documentation in the docs.amdc.dev repository and review its existing data-logging examples. Add a section using the provided pandas and Savitzky-Golay filtering example, then verify that the documentation builds and the new section renders correctly.