bakery already fully covers what the PKGBUILD provided (binary, systemd
--user service where applicable, dependency declarations) except a LICENSE
copy, which bakery.toml's new license_file field now closes. Removes
packaging/arch/ and .forgejo/workflows/package.yml; adds the LICENSE
artifact to each release/dev-release/beta-release workflow's prepare
step. Not pacman-installed inside BOS today (BOS already consumes these
apps exclusively via build-local.sh's skel-staging), so this only removes
the option to `pacman -S` outside of BOS/bakery.
- breadbox/Cargo.toml: depend on bread-theme with gtk feature
- breadbox/src/main.rs: remove local Palette + hex_to_rgba; use
bread_theme::{load_palette, hex_to_rgba, gtk::apply_user_css}
- bakery.toml: describes breadbox for bakery install
- release.yml: builds on hestia self-hosted runner, publishes binaries to
dl.breadway.dev and GitHub Releases on v* tags
