Maintenance and Auth Removal

[havok2063]

This PR removes the authentication from the marvin package, with respect to the API and web login. The Flask-JWT-Extended was creating conflicts with other package dependencies, namely werkzeug, jinja. Marvin is tested to install and run in python 3.11-3.13 envs.

This PR also performs several maintenance tasks:

• Updates the Github Action workflows
• Fixes the CI/CD test suite
• Updates the ReadtheDocs config and fixes the RTD build
• Removes some hardcoded package pins
• Pins packaging < 22 to deal with Invalid version: 'v3_1_1' #823
• Pins numpy < 2
• Adds basic pyproject.toml to conform with modern package specs (but retains original setup.cfg)