Review and fix GitHub Pages docs configuration

[virtualian]

Summary

Docsify documentation was added in #66. Need to enable GitHub Pages and verify the setup works correctly.

Tasks

• Enable GitHub Pages (Settings → Pages → Source: main branch, /docs folder)
• Verify site loads at https://virtualian.github.io/marr/
• Test sidebar navigation works
• Test search functionality
• Verify all internal links resolve correctly
• Check mobile responsiveness
• Fix any issues discovered

Context

Docsify setup includes:

• docs/index.html — Entry point with config
• docs/_sidebar.md — Navigation structure
• docs/README.md — Landing page
• docs/.nojekyll — Prevents Jekyll processing

References

• Docsify docs: https://docsify.js.org/
• PR that added docs: Create comprehensive MARR documentation (#29) #66