- Custom 'diagram' Prism language: box-drawing chars get neutral color,
text labels get a saturated blue so they pop against the structure
- CodeBlock gains showLineNumbers prop (default true) and skips Prism
highlighting when lang is empty
- Diagram block in index page uses lang='diagram' with line numbers off
- Dark mode --link-accent bumped from #58a6ff to #79bbff for better
visibility against dark backgrounds
Tommy D. Rossi
1a9c6ddcd0