77 - Added editable dropdowns for assignment creation/editing

[dvcabiya]

Proposed changes

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Assignment editing now has a dropdown which allows you to select from existing category names or create one of your own from the same dropdown. This will help to prevent professors from having to enter the same category name repeatedly while having to mind case-sensitivity. Made a few other smaller changes, like clicking an assignment from the homepage no longer propogates and takes you to the course page, instead taking you to the assignment you clicked.

Types of changes

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What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

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Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of
them, don't hesitate to ask. This is simply a reminder of what we are going to look for before merging your code.

• My changeset covers only what is described above (no extraneous changes)
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[RA341]

reslove conflicts please

[dvcabiya]

reslove conflicts please

conflicts fixed :D