Repo overhaul: Update dependencies and include Actions CI

[PythonCoderAS]

This:

• upgrades as many dependencies as possible without requiring code rewrites
• introduces new CI workflows for linting and testing
• creates a dependabot config so that future version bumps for certain packages can be handled much easier

I personally tried upgrading vue and anything that depended on that to the latest version but that resulted in a lot of build errors that would require code rewrites.

In the process this also fixed several audit issues, although most of the audit issues will require the vue upgrade and code rewrite.

[stirante]

Thank you! I'm not much of a JS developer myself, I appreciate it.