Revert back to the official Gluegun package

[mikenikles]

With the change in the plugin structure, we can possibly get rid of our custom gluegun implementation. Shall we do this in this PR, or in a follow-up?

In my opinion, this PR is big enough, so I'd say we should do it in a new one. In case you think we should do it with this, I'd be fine with it either. 👍

Originally posted by @Cahllagerfeld in #274 (comment)

[Cahllagerfeld]

The only downside might be the failing CI again, because of the change that happened with node 14 and 16

[Cahllagerfeld]

Conclusion on this. We may delete our fork, refork and just do that one single adjustment to remove that TS-Error.