This commit adds the links to the most important services back to the
homepage, and makes the titles of the services on the services overview
page links to that web service.
The reason for this is that I've noticed a bunch of people trying to
navigate to e.g. Nextcloud and just getting lost on the homepage.
* Separate german and english language pages
* Add a services page with details per service
* Move hakken dates into the same container as the text
* Introductory text on the homepage
