Add endpoints documentation + move CONTRIBUTING.md to docs

[Leonabcd123]

WIP: add documentation to every endpoint under dojo_plugin/api/v1.

STATUS:

• Add documentation for auth.py
• Add documentation for belts.py
• Add documentation for discord.py
• Add documentation for docker.py
• Add documentation for dojos.py
• Add documentation for feed.py
• Add documentation for score.py
• Add documentation for scoreboard.py
• Add documentation for ssh_key.py
• Add documentation for test_error.py
• Add documentation for user.py
• Add documentation for workspace.py
• Add documentation for workspace_tokens.py

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✅ All modified and coverable lines are covered by tests.

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[Leonabcd123]

Might need to have someone take a look at the belts one. I'm not so sure that I got the database query correctly.