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-git/.SRCINFO

@@ -2,7 +2,7 @@ pkgbase = proton-drive-for-linux-git
 	pkgdesc = Unofficial Proton Drive client: FUSE files-on-demand mount, CLI, GTK4 app, tray (git)
 	pkgver = 2.6.1.r0.g6f100db
 	pkgrel = 1
-	url = https://github.com/narrrl/proton-drive-linux
+	url = https://proton-drive.narl.io
 	arch = x86_64
 	license = MIT
 	makedepends = cargo

packaging/aur/proton-drive-for-linux-git/PKGBUILD

@@ -5,7 +5,7 @@ pkgver=2.6.1.r0.g6f100db
 pkgrel=1
 pkgdesc="Unofficial Proton Drive client: FUSE files-on-demand mount, CLI, GTK4 app, tray (git)"
 arch=('x86_64')
-url="https://github.com/narrrl/proton-drive-linux"
+url="https://proton-drive.narl.io"
 license=('MIT')
 depends=('fuse3' 'gtk4' 'libadwaita' 'webkitgtk-6.0' 'dbus' 'gcc-libs' 'glibc'
          'hicolor-icon-theme')