Reverse Prerequisite Tree

[sciffany]

Context

Solves #3202

Implementation

Use CSS to reverse formatting of Prerequisite Tree

Result

Before

After

Other Information

I renamed some variables from prereq to depedent, as they are mostly used to refer to the dependent modules (e.g. CS3247 above)

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[chrisgzf]

for ref: alternate implementation in #3291 but we'll review this PR first @taneliang

[li-kai]

Thanks for working on this! I really like the renaming, it definitely makes it easier to understand!

[li-kai]

For accessibility reasons, we should not use row-reverse here.
I know it's a lot more work to flip the dom order, but I think it's worth it to prevent confusion for our fellow students with visual disabilities.