[Syllabus] Hide undated assignments from the syllabus course summary

[Estefania]

The course summary in the Syllabus page displays dated assignments in chronological order at the top, followed by undated assignments in alphabetical order. This can be very confusing and hard to navigate, but it can only be avoided by removing the course summary in its entirety. Could we have a dropdown that would hide or show the undated assignments? The calendar has this exact feature already.