Refactor repository structure

[Archmonger]

Description

ReactPy was switched to a monorepo structure a while back. This change unfortunately over-complicated the toolchain, CI, and project structure to the point where it was unmaintainable.

This PR refactors large parts of the repository to make ReactPy easier to maintain. Since the LOC changes in this PR started getting out of hand, a follow up PR will be needed to standardize the repo structure to perfectly match our other repos.

Changelog

• Refactor repo away from monorepo structure into something more standard/maintainable
  • Project dependencies have been simplified to python > 3.9, hatch, and bun.
  • All tool chain commands are now funneled through hatch with commands being near identical to our other repos.
  • Documentation commands have an optional dependency of docker, which is primarily used for deployment.
• Replace react usage with preact/compat within @reactpy/client.
  • This was previously being done via build-time name substitutions, but realistically ReactPy is the only user of @reactpy/client, so we may as well "clean up" the build path for ourselves.
• Remove tests for module_from_template due to unfixable failures

Checklist

Please update this checklist as you complete each item:

• Tests have been developed for bug fixes or new functionality.
• The changelog has been updated, if necessary.
• Documentation has been updated, if necessary.
• GitHub Issues closed by this PR have been linked.

_{By submitting this pull request I agree that all contributions comply with this project's open source license(s).}