MKDocs v1 is no longer maintained

Describe the bug
MKDocs v1 is unmaintained and v2 is being released with no plugin support

There are a few forks and drop in replacements, one of the MKDocs maintainers created ProperDocs which maintains compatibility.
https://github.com/orgs/ProperDocs/discussions/33

See also https://fpgmaas.com/blog/collapse-of-mkdocs/

The Material for MKDocs have also launched a documentation site zensical
https://squidfunk.github.io/mkdocs-material/blog/2026/02/18/mkdocs-2.0/

 │  ⚠  Warning from the Material for MkDocs team
 │
 │  MkDocs 2.0, the underlying framework of Material for MkDocs,
 │  will introduce backward-incompatible changes, including:
 │
 │  × All plugins will stop working – the plugin system has been removed
 │  × All theme overrides will break – the theming system has been rewritten
 │  × No migration path exists – existing projects cannot be upgraded
 │  × Closed contribution model – community members can't report bugs
 │  × Currently unlicensed – unsuitable for production use
 │
 │  Our full analysis:
 │
 │  https://squidfunk.github.io/mkdocs-material/blog/2026/02/18/mkdocs-2.0/

For now I'd suggest pinning mkdocs<2.0.0 and then considering alternatives

The issue names no files or tests; start by locating the repository's MkDocs dependency and configuration. Confirm how the project currently invokes MkDocs and identify the appropriate supported version constraint. Done means the dependency is safely pinned below 2.0.0 and the documentation build still works.