feature-request(docs): style improvements (syntax highlighting, strong side- and toolbar)

[ngfelixl]

The docs page is the main entry point to this library and it should look a bit more friendly in order to gain more users. Two suggestions:

1.) We could add syntax highlighting for the example code in the docs page at https://interfacewerk.github.io/iwerk-angular-ui/#/. Prism.js or highlight.js seem to be promising. Compodoc has prism.js support.

2.) We should use a different color for the side- and toolbar. Suggestion: The accent color is the interfacewerks logos orange. Can we use the interfacewerks logos blue as the background color for these to items?

[ngfelixl]

In addition to that, can we add a logo of interfacewerk with link to https://interfacewerk.de in the readme? This page is displayed on NPM as a repo description and is quite a good place to refer the interfacewerk website.