* fix(web): drop stale 100% offline copy and mark VocaWin alpha
vocalinux.com still called VocaWin planned and said the Linux app was
100% offline. Local engines stay on the machine. Remote API is opt-in.
VocaWin is developer alpha: unsigned NSIS (~12 MB) and MSI (~34 MB),
latest prerelease v0.1.0-alpha.1.
Fixes#709
* fix(web): drop leftover never-leaves claims
Open source and privacy pages still said voice data never leaves the
machine. Local engines stay local. Remote API is opt-in.
