menuband landing: rework tagline, drop stale free+open-source meta
New tagline leans into the dig instead of restating the function:
"Taking macOS' standard instruments out of the 🎸 Garage and kickin'
it on the curb!" — and removes the lingering "Free + open source."
sentence from the page <meta description> for App Store framing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>