Update mkdocs config for updated Material theme v6

@Mkamel @khadija.radwan This is a Merge Request with the changes needed to get your pipeline working again, just click the merge button to add changes to main branch.

About the changes

The Material theme was upgraded last year, so required some changes. Since the continuing student has not made many commits, I added the same changes as found in the student template used for students this cycle year.