[Serve] [Doc] Update intro page

[simon-mo]

https://ray--27735.org.readthedocs.build/en/27735/serve/index.html

Signed-off-by: simon-mo [email protected]

Why are these changes needed?

• Update the intro page to incorporate content from FAQ
• Delete FAQ
• Added model composition example to intro page
• Update the code samples

Related issue number

Closes #27468

Checks

• [x] I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• [x] I've run scripts/format.sh to lint the changes in this PR.
• [x] I've included any doc changes needed for https://docs.ray.io/en/master/.
• [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • [ ] Unit tests
  • [ ] Release tests
  • [ ] This PR is not tested :(

[edoakes]

Will do a pass after @dmatrix's comments are addressed

[simon-mo]

Thanks @dmatrix and @architkulkarni, comments addressed. @edoakes ready for your look.

[simon-mo]

Addressed!