Refactor backend, Replace frontend toolchain, Update docker config

[hrz6976]

This PR changes:

• frontend: webpack -> vite (much faster builds, hmr support)
• docker: updated configs (+ scripts, persists nltk&certs&models)
• backend: flask -> fastapi (better perf with query optimizations, typed, api docs)
  Please close Toolchain chores #25 after merge ☺️

[codecov-commenter]

Codecov Report

Merging #27 (a905ed5) into main (b94ffa0) will increase coverage by 13.57%.
The diff coverage is 68.52%.

@@             Coverage Diff             @@
##             main      #27       +/-   ##
===========================================
+ Coverage   67.64%   81.22%   +13.57%     
===========================================
  Files          17       23        +6     
  Lines        2318     2524      +206     
===========================================
+ Hits         1568     2050      +482     
+ Misses        750      474      -276     

Impacted Files	Coverage Δ
gfibot/data/update.py	87.77% <ø> (+0.55%)	⬆️
gfibot/backend/scheduled_tasks.py	37.20% <37.20%> (ø)
gfibot/backend/server.py	61.70% <61.70%> (ø)
gfibot/backend/routes/github.py	69.72% <69.72%> (ø)
gfibot/backend/routes/model.py	70.00% <70.00%> (ø)
gfibot/backend/routes/repos.py	76.97% <76.97%> (ø)
gfibot/backend/background_tasks.py	77.38% <77.38%> (ø)
gfibot/backend/routes/user.py	78.57% <78.57%> (ø)
gfibot/backend/routes/issue.py	83.87% <83.87%> (ø)
gfibot/__init__.py	89.28% <84.61%> (-4.84%)	⬇️
... and 10 more

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