Replace Bun.argv with process.argv, Bun.file() with fs/promises,
Bun.stringWidth with string-width package, and Bun.wrapAnsi with
wrap-ansi package for better compatibility.
- Use terminal-link for clickable hyperlinks
- Reduce heading color brightness
- Remove extra trailing newlines from code blocks
- Fix horizontal rule spacing
- Wrap codespan content in backticks
- Suppress language error warnings from highlighter