s23e2

Minor edits; S23 schedule change

Swapped weeks 3 and 4 to better work with homework schedule, since
traits are a pre-req for a lot of interesting code.

Also added:
    - Course staff mailing list
    - Some minor policy edits
    - Graduate grading

s23e1

Update room location for S23

s23r1

Update for S23

f22e1

Final F22

Add project presentations and rework assignments.

f22r1

Initial draft for f22 semester.