I have made a single page site. It has no navigation either on the side bar or the horizontal bar.
The header has also been removed to make the site simple.
The main focus of this design is for groups of teachers in the same hub / team / department to have a single place to put links to their individual class sites.
The main buttons are designed to have a picture of the teacher and the name and classroom on them.
The logo could be the school logo.
All the buttons on this example are linked to external sites. You could link them to pages on the same site or to separate sites made by the individual teachers.