fix for handout renaming issue

[hamza14102]

Changed assignments.yaml to have worksheet variable to be the worksheet url instead of a true/false flag. Changed assignments page to use that modified variable to fetch lab link instead of assignment url.

[RMenezes782]

Should the handout name be 'mad mad access patterns' or 'mad mad access pattern'? iirc we decided on the plural, so maybe change the worksheet name if that is correct, else disregard.

Other than that, looks great!