Recalculate license

- Use /var/run instead of /run
- Correct type (socket) for greetd.sock
- Stricter rule for /var/run/greetd.run

Move xdg-desktop-portal workaround setup to %%post

Drop video group membership
Update documentation

greetd code was always sourcing /etc/profile with /bin/sh in non-login mode.
This causes Fedora profile scripts to source bashrc and overwrite SHELL.

Update SELinux policy
Update documentation

Apparently `rust-` is not required for packages outside of crates.io.