Update docs

[cffls]

Add FAQ in the docs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.86%. Comparing base (0f412ac) to head (30c021f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #469   +/-   ##
=======================================
  Coverage   89.86%   89.86%           
=======================================
  Files          33       33           
  Lines        5003     5003           
  Branches      759      759           
=======================================
  Hits         4496     4496           
  Misses        327      327           
  Partials      180      180           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.