Allows the possibility to deploy custom theme with forgejo. You can test it with this https://git.disroot.org/Disroot-themes/forgejo-beetroot for example.
Co-authored-by: meaz <meaz@disroot.org>
Co-authored-by: muppeth <muppeth@disroot.org>
Reviewed-on: Disroot-Ansible/gitea#24
Reviewed-by: muppeth <muppeth@no-reply@disroot.org>