Editing assignments directly in Queue

What does this mr do?

This MR adds the possibility to edit assignments directly in Queue. Previously, editing was only possible in Portal.

The assignment overview in the modules page now has another button for editing next to the "delete assignment" button. It leads to a new page where changes can be made to the basic properties of the assignment (name, description, deadline). After a successful edit it redirects back to the module page.

Closes #700 (closed)

Screenshots

before

after

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made.
• Tests were created to test the feature.
• I have updated the documentation accordingly.
• I adhere to the style guide.