Get a proper domain

[Zabuzard]

Eventually, this book should be accessibly nicely via Google and by externals. Therefore, we should secure ourselves a proper domain and then publish the book there.

For example: modernjava.org or similar.

(please refrain from purchasing this privately, this would harm our project - we have to purchase it with our open-collective account: https://opencollective.com/together-java)

[Zabuzard]

Blocked until the project gained some speed and has some content to show off.