Developer Documentation - Overview of architecture, key classes, configuration options, and components

[Skwangles]

At my work, we've found an enourmous benefit to using AI to generate some overview documentation, especially around the Architectural side.

Idea being this is more of a developer docs, than the read-the-docs page, especially given the mermaid docs.
I can alo integrate gh coplit to auto update them here on PR.

It makes things a lot easier to start contributing if you can get a basic mental model of how the code is structured and works, even if it is not comprehensive.

This branch:
Uses GenAI to provide architectural diagrams, summarise the key components and classes. Provides a more thorough break down than the existing readthedocs on configuration parameters.

[Skwangles]

Future thing I can add in is a GitHub action with GH copilot to auto update these docs when new PRs are merged? Some attempt to avoid stale docs

[Skwangles]

I'll actually integrate them into the read-the-docs