Update secondary material with new HIFIS logo, colors and fonts

• update HIFIS_net_Sticker_qr
• update HIFIS_net_Sticker_qr_large
• remove obsolete software spinoff?
• remove obsolete security spinoff?
• update HIFIS + DESY spinoff for hifis events
• update postcard
• update poster
• update A3 and A6 poster templates
• update badges
• update A5 block template

changed milestone to %UX Medium-Term

added Logos Progress::2_ToDo labels

assigned to @sophie.servan

marked the checklist item update poster as completed

mentioned in commit 0b4d5be6

mentioned in merge request !54 (merged)

marked the checklist item update HIFIS_net_Sticker_qr as completed

marked the checklist item update HIFIS_net_Sticker_qr_large as completed

changed the description

added Progress::3_Doing label

removed Progress::2_ToDo label

unassigned @sophie.servan