chore: point homepage metadata at proton-drive.narl.io

The About dialog's website link, the README, and the package metadata
(Cargo, PKGBUILDs, AUR .SRCINFO, .deb, .rpm) now use the project
homepage. Source code, issue, and release links stay on GitHub.

packaging/aur/proton-drive-for-linux/.SRCINFO

@@ -2,7 +2,7 @@ pkgbase = proton-drive-for-linux
 	pkgdesc = Unofficial Proton Drive client: files-on-demand FUSE mount, CLI, GTK4 app and tray
 	pkgver = 2.6.1
 	pkgrel = 1
-	url = https://github.com/narrrl/proton-drive-linux
+	url = https://proton-drive.narl.io
 	arch = x86_64
 	license = MIT
 	makedepends = cargo