1864 custom project images

[galethil]

Checklist

• [x] I have followed (at least) the PR section of the contributing guide.
• [x] I fixed all necessary PR warnings
• [x] The commit history is clean
• [ ] The E2E tests are passing
• [x] If possible, the issue has been divided into more subtasks
• [x] I did a self review before requesting a review from another team member

Description

Possibility too upload custom image

How to test

1. login as e.g. mstein
2. Try to create new project
3. Upload custom image
4. Verify that project was created and image is stored and displayed

Closes #1864