Issues editing `~/.gitconfig`

[markochk]

1. in terminal, run git config --global core.editor "flatpak run --file-forwarding re.sonny.Commit @@"
2. in terminal, run git config --global -e. It'll open the Commit window and print this message in terminal:

   hint: Waiting for your editor to close the file... Warning: unknown commit type encountered in: /run/user/1000/doc/ab12bc58/.gitconfig

3. pressing Abort will delete all contents in .gitconfig, leaving the user with an empty file
4. however, if I don't abort and try to make some changes to .gitconfig, I'm unable to as existing content is read-only, and I'm only able to insert content at the start of the file or append it at the end of the file

[sonnyp]

Fixed in the next release.

I also added syntax highlighting for gitconfig/hgrc