docs: sync 06-09-2023 (#840)

* docs: use cases (GITBOOK-193)

* docs: No subject (GITBOOK-194)

* docs: delete anyscale notebooks from docs (GITBOOK-195)

* docs: remove outdated call to head (GITBOOK-196)

* docs: Add FAQ page (GITBOOK-197)

---------

Co-authored-by: Amit Goren <amit@arize.com>
Co-authored-by: Xander Song <xsong@arize.com>