refactor(docker): clean docker orchestration for easier setup

[frgfm]

This PR introduces the following modifications:

• cleaned all steps to setup or contribute
• cleaned docker and CI
• adds a status route to the API
• add docker for gradio, and grafana
• add healthcheck for backend

[codecov]

Codecov Report

Attention: Patch coverage is 82.35294% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 83.97%. Comparing base (c699719) to head (ff28b35).
Report is 3 commits behind head on main.

Files	Patch %	Lines
src/app/main.py	71.42%	2 Missing ⚠️
src/app/services/ollama.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
+ Coverage   83.53%   83.97%   +0.43%     
==========================================
  Files          29       29              
  Lines         899      911      +12     
==========================================
+ Hits          751      765      +14     
+ Misses        148      146       -2     

Flag	Coverage Δ
unittests	83.97% <82.35%> (+0.43%)	⬆️

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