This website now features a new light colour theme. Instead of white text on a dark blue background as before, this website now has a more standard colour scheme of black on white.
The base is is now vanilla Bootstrap 3 instead of the modified version before. But my favourite part of the old colour scheme remains: orange links and buttons. In there I've added some tricks like the breadcrumb path at the top.
Update 2020-05
While keeping the overall color scheme, the theme (style sheets and templates) has been reworked. The dependencies on Bootstrap have been removed and instead the theme is nearly standalone now. This cuts away the unnecessary bloat and makes the website leaner.