Remove first book auth API (PP-903) 🔥

[jonathangreen]

Description

• Remove the unused Firstbook Auth API.
• Update the static files route so its only added if its needed.
  • Update the static files controller, since its only used in a very simple case now.

Motivation and Context

• I was looking into what the static files sitewide setting was used for, and it was only used here. Looking at firstbook, it doesn't seem like we are using it anywhere.

How Has This Been Tested?

• Tested locally
• Tested in debug config with local admin UI
• Running tests in CI

Checklist

• I have updated the documentation accordingly.
• All new and existing tests passed.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (178f69c) 89.61% compared to head (87f3a4f) 89.56%.

Files	Patch %	Lines
api/admin/routes.py	28.57%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1642      +/-   ##
==========================================
- Coverage   89.61%   89.56%   -0.05%     
==========================================
  Files         247      246       -1     
  Lines       28952    28875      -77     
  Branches     6608     6600       -8     
==========================================
- Hits        25944    25862      -82     
- Misses       2024     2029       +5     
  Partials      984      984              

Flag	Coverage Δ
Api	75.46% <54.54%> (-0.09%)	⬇️
Core	59.07% <0.00%> (+0.13%)	⬆️
migration	26.50% <0.00%> (+0.07%)	⬆️

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[tdilauro]

Looks good!