[Doc] Run pre-commit on docs

[peytondmurray]

Why are these changes needed?

This PR runs the pre-commit hooks on the docs/ subdirectory. The changes you see here include

• Removing useless whitespace at the end of lines and on blank lines
• Adding newline characters at the end of files
• Applying prettier formatting to html/js/css
• I modified .prettierrc.toml to not put semicolons at the end of js lines. We're being inconsistent here anyway
• Fixed an issue with the CSAT widget where two <span> elements had no closing tags; this was picked up by prettier
• Fixed two cases where double-backticks were touching non-whitespace in RST files.

Related issue number

Closes #42587.

Checks

• I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
  • I've added any new APIs to the API Reference. For example, if I added a
    method in Tune, I've added it in doc/source/tune/api/ under the
    corresponding .rst file.
• 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 :(

[peytondmurray]

After a discussion, I'm going to break this PR into small bits to minimize code owner impact. Closing.