XBND-1399: feat: Standalone community extension

High-Level Proposal*

Related PR: xbe_static_docs!12 (merged)

This repo used to contain both an embedded sphinx_repo_manager sphinx extension and build/deployment logic.

This PR converts this repo into a standalone, community plugin that can be imported into any Sphinx project (+a demo doc repo/layout).

Release Notes*

• Created standalone sphinx_repo_manager plugin with docs/templates
• Created Minimalistic demo, doc repo, and manifest
• Apart from the demos, removed build/deploy logic directly relating to XBE
  • To be moved to https://source.goxbe.io/Core/docs/xbe_static_docs
• Added support for cloning local git dirs
• Significantly reduced error redundancy and improved error clarity
  • Now including showing full git CLI commands on err
• Improve sanitizing when testing locally with secret keys
• Greatly extended logs when debug_mode set true in the manifest
• Created a barebones demo_doc
  • Added as the default project to the repo manifest
• Created a barebones source/_static_docs/index.rst to demonstrate local static docs handling
  • Content here symlinks to content/-/ (for short url slug, similar to how GitLab does it)
• Now supporting Sphinx 8+
• Meta: Updated this repo's MR template

Media

Build:

Extended debug mode (for copy+paste CLI output):

Output:

---

Tests

[x] I tested/built with make html and confirm the expected outcome. [x] Tested building with demo_doc in manifest [x] Tested demo_doc standalone build (without this ext) [x] Tested with source/_static_docs/index.rst -> symlinked fine to content/-/ (same link signatures) [x] Verified build output html display [x] Tested deployment to RTD

Post-Merge TODO

1. Submit ext to PyPi
2. Submit ext to Sphinx list of useful repos