Support offline doc generation (#784)

[aaronchongth]

(cherry picked from commit 828171e)

What's new

• Splitting cache and static
• Allow generating api-server docs without internet access

Self-checks

• I have prototyped this new feature (if necessary) on Figma
• I'm familiar with and follow this Typescript guideline
• I added unit-tests for new components
• I tried testing edge cases
• I tested the behavior of the components that interact with the backend, with an e2e test

[codecov]

Codecov Report

Merging #786 (04eaa15) into main (c1d78d2) will increase coverage by 0.00%.
The diff coverage is 85.71%.

@@           Coverage Diff           @@
##             main     #786   +/-   ##
=======================================
  Coverage   52.95%   52.96%           
=======================================
  Files         268      268           
  Lines        6794     6797    +3     
  Branches      907      907           
=======================================
+ Hits         3598     3600    +2     
- Misses       3055     3056    +1     
  Partials      141      141           

Flag	Coverage Δ
api-server	81.45% <85.71%> (-0.02%)	⬇️

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Files Changed	Coverage Δ
packages/api-server/api_server/default_config.py	100.00% <ø> (ø)
packages/api-server/api_server/fast_io/__init__.py	77.08% <50.00%> (-0.39%)	⬇️
packages/api-server/api_server/app_config.py	83.72% <100.00%> (ø)
...ges/api-server/api_server/repositories/__init__.py	100.00% <100.00%> (ø)
...api-server/api_server/repositories/cached_files.py	100.00% <100.00%> (ø)

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