Htwkimn-theme

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- navi css changed
- header link added
- header home-button rule fixed
- doc extended
- dummy content added

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- documentation fixed

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- version dependencies updated

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- workaround to remove "relations_library" navi item of Faculty Staff Directory

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- requirement constraints updated

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- header variants added
- mobilenavigation as dependency added
- docs completed, example images added
- generic setup, ftw.upgrade activation added
- more expressive comments and filenames