Feature/31 create pdf is broken

Merged Felix Herrmann requested to merge feature/31-create_pdf-is-broken into develop

HTML and CSS for PDF generation.

Test by generating a dataset description pdf under files-tab.

As weasyprint raises a huge number of warnings if the project.css file is included in the template, a small number of css definitions for PDF formatting are included using djangos {% include %} template tag.

Fixes #31 (closed).

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