Split project into separate files

[makupi]

• app.py app entrypoint for uWSGI or flask run
• nookipedia/__init__.py contains app initialization/setup
• nookipedia/cache.py cache in a separate file so it can be imported without circular import issues
• nookipedia/cargo.py cargo access
• nookipedia/config.py config and constants
• nookipedia/dashboard.py dashboard setup
• nookipedia/db.py contains database access
• nookipedia/errors.py error handling (the error handlers are now registered in __init__.py though instead of decorator)
• nookipedia/middlewares.py authorization "middleware"
• nookipedia/models.py formatting of data
• nookipedia/api/* contains all the routers, now handled through blueprints (registered in nookipedia/__init__.py)

Formatted code with black . --line-length 100 Closes #54

[KevinPayravi]

This is good stuff, thank you @makupi!

Something to consider: while we only cover New Horizons right now, we'll eventually have endpoints for other games. As-is we could add endpoints for the other games to the existing files (furniture.py, fish.py, etc.). Other options might be to create separate directories for each game (for now, an ACNH folder, and in the future ACNL, etc.), or just name the files with a game prefix (e.g. nh_furniture.py, nh_fish.py, etc.).

The other thought I have is moving the static directory back to the root, since it's its own thing separate from the Python app.

[makupi]

@KevinPayravi I can move the existing endpoints to a separate ACNH folder, probably easier to do right now than later and I can try to move the static back but flask was being somewhat weird about that 😅