#238 Add AppImage build support
Implements
- Downgrade to libadwaita 1.3 for wider distro support
- Add build script, workflow, and docs for AppImage
- Add build docs for Debian (apt) and Void Linux
- Building AppImage in CI
Implemented
- Switch reacts to burrow socket and network changes
- meson as build system
- Basic diagnostics to ensure burrow is installed properly
- Flatpak / Meson Building
