add display filter to schedule page

[trgardos]

I added a display filter to the schedule page of https://tools4ds.github.io/fa2024/schedule_a1/. It's nice to be able to just see the lectures or assignments.

The change is fairly self-contained in https://github.com/tools4ds/fa2024/blob/main/_layouts/schedule_a1.html.

I'll create a PR for you to test it out.

[jconsidi]

I merged and deployed, but the check boxes don't seem to be doing anything.

I am seeing this in the build action -

https://github.com/DL4DS/fa2024/actions/runs/11957791459