config-help gains two new flags:
- --html / -w: opens docs/html/index.html in the default browser using
smart browser detection (xdg-mime https scheme handler → known binaries
→ xdg-open fallback) to avoid MIME-type mismatches with non-browser apps
- --man / -m: opens the compiled docs/fish-config.1 man page via man -l
config-update is a new function that pulls the latest fish config from the
hard-coded upstream URL without requiring a configured git remote. Suppresses
git output and reports status with colored messages. Supports --dry-run and
--force flags.
README updated to document all new commands.
