Menu, Copyright and links in footer

[danieleguido]

• [x] This is the sentence that needs to be added in the menubar (or preferably in a footer)

  Copyright © Université du Luxembourg 2022. All rights reserved. The link below the C2DH logo should point to https://www.uni.lu

• [x] Add "menu" next to the menu icon :)
• [ ] "menu" is not visible after the intro, in /stories

[giorgiouboldi]