Automatic Metrics API

[jukent]

Closes #319

Adds:

• necessary extensions to the conf file
• a Python script that accesses the secrets for each GA4 property and writes to a json file if there are more than 100 new users
• a Python script that writes the metrics.md file from this json (can easily be edited to display charts and things)
• a GitHub action that runs this script weekly and pushes the changes
• adds this metrics page to the about section of the footer-menu

There are new secrets for each GA4 properties ID and for the credentials file.

Here is the list of additional dimension and metric keys.

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[jukent]

Closing this because with the curl grabbing from my main branch I have to remember to change things on the branch and on main. I'm going to make a new PR from main