Refactor basic menu

The menu has now this structure

- Basics
  - Contact
  - Commercials
  - Photos
I created a test to upload a text file in the photo create action.
See
https://github.com/openSUSE/osem/pull/437/files#diff-05a39a8b8917f377754ab5b9ed9dc3bfR55

Therefore I needed a text file!