Ask Tutanota whether they want to integrate KleckRelay

[Myzel394]

I have been thinking about this for some time, it would be very cool to have native support creating aliases. Tutanota is a great email service (and other services too), we should ask them if they would like to combine KleckRelay as an alias email service with their email.

Before asking them though, I'd like to first improve the website, add docs and add some more features to have something we can show off.