Integrate MPIWG Base Theme into Jekyll Theme

Sass to integrate:

https://gitlab.gwdg.de/b.connect/mpiwg-sass-theme

Todos:

• Make theme gem ready

• Add to gem to MPIWG Jekyll Theme

• Style following types

  • @portal.fkraeut [WIP] Adding styles
    • menu
    • pages with header images
    • posts, i.e. pages without header images (e.g. event page)
    • headlines, H1, H2, H3, H4
    • grey box element (e.g. at the bottom of https://www.mpiwg-berlin.mpg.de/users/fkraeutli)