chore: Migrate docs out

[monoxgas]

• Finishing migration from docs to our centralized repo - pulling out all mechanics here.
• Unwinding some incorrect renovate stuff that went through due to misconfigurations.

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Generated Summary:

• Removed the docs-update.yaml workflow file which previously triggered documentation updates upon pushes to the main branch or manually.
• Deleted the generate_docs.py script from .hooks, which was used for auto-generating documentation from Python code.
• Updated the Python version in rigging_pr_description.yaml workflow from 3.14 to 3.13.
• Deleted several documentation files (concepts.mdx, overview.mdx, quick-start.mdx, and more) related to Strikes AIRT, leading to potential loss of information and examples for users.
• Removed assets related to documentation visuals (PNG files) that may have been used in the now-deleted documentation files.
• This refactor may simplify CI/CD workflows but results in a significant loss of documentation and potentially impacts user guidance and accessibility.

This summary was generated with ❤️ by rigging