Basic list of media,materials

Related #228 (closed)

assigned to @jandt-desy

added 5 commits

• 41723341 - list of media content
• 552f05e8 - Update spotlight mHM
• 024f5200 - Bump jekyll from 4.2.1 to 4.2.2
• a554832e - Add HIFIS handouts to media folder
• a87ab379 - list of media-materials

Compare with previous version

mentioned in commit dc873e25

merged