Beautify UI

[dennis-eichardt-sbb]

There is no real UI yet.

Create a basic, but beautiful UI that works for big screens and mobile devices.

[MadScientistCH]

Bootstrap now integrated into project.

Made some very fundamental UI changes. Especially the notifications of the process chain at the bottom now look way better.

But it will need a lot, lot, lot more work to make this optically great.