feat: other/customized commit message convention

Aegis now supports co-authored-by. maybe we should allow people to customize so they have other tags in commit message?

A common one i can see many usage is "no-webhook" which requires the instance to *not* trigger webhook, e.g. something like this:

```
fix: fixes, part 1

should not trigger webhook since this is not done.

!no-webhook
```