What does this mr do?

Add a calendar to the overview page for the students, displaying their lab sessions, so they can easily find a lab to enrol for.

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.

closes #499 (closed)