Summarize information in FAQ

Summary:
As part of an experiment to evaluate how AI can be useful
for documentation and howto, this FAQ has partially been
prepared with the help of ChatGPT.

Ref T1880

Test Plan: Read the FAQ

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1880

Differential Revision: https://devcentral.nasqueron.org/D3146