update swagger documentation

[K-Schubert]

Description

In app = FastAPI(), specify more verbose documentation.

Eg.

app = FastAPI( title="ChimichangApp", description=description, summary="Deadpool's favorite app. Nuff said.", version="0.0.1", terms_of_service="http://example.com/terms/", contact={ "name": "Deadpoolio the Amazing", "url": "http://x-force.example.com/contact/", "email": "dp@x-force.example.com", }, license_info={ "name": "Apache 2.0", "url": "https://www.apache.org/licenses/LICENSE-2.0.html", },)

• Add config/app_config.yaml with fastapi documentation.
• Add variable processing in config/base_config.py.
• Import app_config vars in autocomplete/app/main.py, indexing/app/main.py and rag/app/main.py.