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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nusmods-export – ./export

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[chrisgzf]

for ref: alternate implementation in https://github.com/nusmodifications/nusmods/pull/3291 but we'll review this PR first @taneliang