Take over team data where appropriate

• Take over team data from https://gitlab.hzdr.de/hifis/software.hifis.net/-/blob/master/_data/hifis_team.yml , where appropriate
• set rank: 0 to not list them in the high-level team list as discussed.

added Critical + 1 deleted label

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

changed the description

assigned to @frust45

mentioned in merge request !223 (merged)

created merge request !224 (merged) to address this issue

mentioned in merge request !224 (merged)

mentioned in merge request !177 (merged)

closed with merge request !224 (merged)

mentioned in commit 22db5fab