Delete vaults

### Please agree to the following

- [X] I have searched [existing issues](https://github.com/cryptomator/hub/issues?q=) for duplicates
- [X] I agree to follow this project's [Code of Conduct](https://github.com/cryptomator/hub/blob/develop/.github/CODE_OF_CONDUCT.md)

### Summary

As a vault owner, I would like to be able to delete it.

### Motivation

Time has shown that Hub users create various test vaults at the beginning to get to know Hub, which they then find annoying. Archiving is obviously not enough for some people.

However, we should link deletion to a "hurdle" so that it doesn't just happen accidentally and people are aware of the consequences. For example, a user could have to enter the recovery key during the deletion process.

### Considered Alternatives

_No response_

### Anything else?

_No response_