docs: add guides for occ, configure_client, and troubleshooting

[bshaffer]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.73%. Comparing base (85388cd) to head (1b3cca1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5441      +/-   ##
==========================================
- Coverage   97.74%   97.73%   -0.01%     
==========================================
  Files         218      218              
  Lines       48235    48235              
==========================================
- Hits        47145    47144       -1     
- Misses       1090     1091       +1     

☔ 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.

[coryan]

The deny failures are probably because this PR needs to rebase to HEAD. You are hitting vulnerability errors that we already fixed.

The formatting error is more complicated:

Error: Could not format "/workspace/guide/src/occ.md".
--
  |  
  | The formatted Markdown renders to different HTML than the input Markdown. This
  | is likely a bug in mdformat. Please create an issue report here, including the
  | input Markdown: https://github.com/executablebooks/mdformat/issues

Maybe we need to update mdformat ??

[dbolduc]

I only looked at the proxy section

[coryan]

Just some drive-by comments.