Sort doc toc
# What does this PR do?

This PR adds a script to automatically sort the model doc part of the documentation ToC, so we never need things like #18011 ever again.

The script runs in the traditional `make style/fixup/quality` setup meaning that:
- `make style` or `make fixup` fix the ToC by auto-sorting it and removing duplicates
- `make quality` just checks whether or not the ToC is properly sorted.
_The documentation is not available anymore as the PR was closed or merged._