Changed style to bootstrap

[swissbyte]

Hi there.

I have modified the page to integrate bootstrap styles. Maybe, you want to integrate this too into your mainline version?

Here you can see a screenshot:

https://imgur.com/fUHKafq

I have also added a debug.py script wich allows a user to test the design even under windows without a real device begind.

[rwbr]

In my opinion this pull request contains too much changes. There is much more than the promised Bootstrap UI in it. I suggest you separate the changes, then probably it can be merged.