v0.5.1

This release:

• Fixes a bug that broke activation when an installed .flatpakref did not suggest a remote name (#106).
• Removes all uses of lib.mdDoc, which has been deprecated in nxpkgs.

What's Changed

• delete all uses of removed lib.mdDoc by @Rafmaninoff in #105
• installer: specify origin when updating flatpakref by @gmodena in #107

Full Changelog: v0.5.0...v0.5.1