Port from Material for MkDocs to Zensical

[johnthagen]

Evaluate Material for Mkdocs replacement, Zensical, when it fully launches

• ⚠️ We're now in maintenance mode squidfunk/mkdocs-material#8523
• https://squidfunk.github.io/mkdocs-material/blog/2025/11/05/zensical/
• Discussions closed as of November 18, 2025 squidfunk/mkdocs-material#8540

mkdoctstrings also is shutting down and the maintainer moving to Zensical

• mkdocstrings is in maintenance mode mkdocstrings/mkdocstrings#806

The biggest change will be evaluating alternatives to the Mkdocs plugins that are used.

• Support plugins mkdocs-html-proofer, mkdocs-video, mkdocs-ununsed-files, api-autonav zensical/zensical#48
• Support mkdocs-htmlproofer plugin functionality zensical/backlog#3
• Support mkdocs-video plugin functionality zensical/backlog#5
• Support mkdocs-unused-files plugin functionality zensical/backlog#6
• Support mkdocs-api-autonav plugin functionality zensical/backlog#7