packaging: build from public gitbutter repo instead of local path

The PKGBUILD url + source pointed at file:///home/mollusk/git/butter/pixelpass,
a local-only path no one else could build from. The repo is public on
gitbutter, so point both at the anonymous HTTPS clone URL.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packaging/arch/PKGBUILD

@@ -1,6 +1,6 @@
 # Maintainer: mollusk <jitty+lc1iz0dc@protonmail.com>
 #
-# Local versioned package, built from the local git repo on `main`.
+# Versioned package, built from the public gitbutter repo on `main`.
 # For a tagged release, switch the source fragment to `#tag=v0.1.0`.
 
 pkgname=pixelpass
@@ -8,7 +8,7 @@ pkgver=0.1.0
 pkgrel=1
 pkgdesc='P2P screen sharing over iroh — no port forwarding, no signup'
 arch=('x86_64')
-url='file:///home/mollusk/git/butter/pixelpass'
+url='https://gitbutter.xyz/mollusk/pixelpass'
 license=('MIT' 'Apache-2.0' 'OFL-1.1')
 depends=(
   'gstreamer'          # gst-launch-1.0 / gst-inspect-1.0
@@ -33,7 +33,7 @@ optdepends=(
 makedepends=('cargo' 'git')
 options=('!lto')
 _branch='main'
-source=("$pkgname::git+file:///home/mollusk/git/butter/pixelpass#branch=$_branch")
+source=("$pkgname::git+https://gitbutter.xyz/mollusk/pixelpass.git#branch=$_branch")
 sha256sums=('SKIP')
 
 prepare() {