Allow auto insert repository name into cgit link

We use one git-notifier-config.yml for all our repositories. Because it`s same. This allow not have duplicate files in server and we can easy maintain it. Also we use cgit . But for make correct link to cgit i must specify project in commit notifier config. So i offer changes which allow use repository name when it not specified manually in git-commit-notifier config for build correct link to cgit