Update documentation after FastAPI migration

[LuiggiTenorioK]

We need to update our documentation to:

• Include a guide to how to access the Swagger UI/OpenAPI generated by FastAPI
• Explain how the auth module works (from GitLab wiki)
• Explain the performance metrics (from GitLab wiki)
• Update old pages with new options

[kinow]

A few comments, but no blockers (feel free to ignore/update them as you see fit) 👍

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.28%. Comparing base (2579e8b) to head (10e2b51).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #140   +/-   ##
=======================================
  Coverage   70.28%   70.28%           
=======================================
  Files          82       82           
  Lines        7932     7932           
=======================================
  Hits         5575     5575           
  Misses       2357     2357           

Flag	Coverage Δ
fast-tests	70.28% <ø> (ø)

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[LuiggiTenorioK]

Ok, now I think that everything is sorted. Also, the RTD webhook already is integrated into this repo.

Here is the preview: https://autosubmit-api.readthedocs.io/en/updt-docs-202411/index.html