Documentation styling broken

Styling of the documentation is now broken (see figures, code highlighting etc.). This happened in part because some of the styles were provided in global less stylesheets which are no longer imported (and should not be).

create a separate HTML template for documentation
create webcomponent for the code highlighting (should be based on highlight.js to have XQuery highlighting)

Also see #151 (closed) for related discussion.

Edited Aug 30, 2018 by Wolfgang

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