Consider implementing Material for MkDocs feedback option

[StevenMaude]

v8.4.0 of Material for MkDocs enables feedback features.

This could be useful for gathering user feedback on the documentation; maybe we should try it out?

Current questions:

• Do we want an actual feedback form? How would that be implemented; Google Form?
• Can we get some useful quantifiable information from positive or negative ratings via Plausible (which I'm not too familiar with, but maybe custom event goals?