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.

.github/workflows/release.yml

@@ -166,7 +166,7 @@ jobs:
           Maintainer: Nils Pukropp <contact@narl.io>
           Depends: fuse3, libgtk-4-1 (>= 4.12.0), libadwaita-1-0 (>= 1.5.0), libsecret-1-0, libwebkitgtk-6.0-4, libimage-exiftool-perl
           Installed-Size: ${INSTALLED_SIZE}
-          Homepage: https://github.com/narrrl/proton-drive-linux
+          Homepage: https://proton-drive.narl.io
           Description: Unofficial Proton Drive client for Linux
            Files-on-demand Proton Drive for the Linux desktop, unaffiliated with Proton AG:
            - FUSE virtual mount with block-level caching