Integrate MkDocs Material to provide enhanced sidebar navigation for documentation at https://skupper.io/docs/ while preserving the existing Transom-based site structure.
- Problem: Transom and MkDocs both want to process files in
input/docs/ - Conflict:
input/docs/index.md(MkDocs) vsinput/docs/index.html.in(Transom) - Transom limitation:
ignored_file_patternsonly matches filenames, not directory paths