Update missing content from software.hifis.net

Which content is still missing?

• events+blog posts can be simply copied
• any other specific stuff missing? @frust45 @erxleb87

added 1 deleted label

added Critical label

changed milestone to %Unification of software.hifis.net and hifis.net (V1.0)

created merge request !205 (merged) to address this issue

mentioned in merge request !205 (merged)

created merge request !213 (merged) to address this issue

mentioned in merge request !213 (merged)

closed