feature(scrolling table of contents ): scrolling navigation implemented

[whymarlene]

Description

Closes #148

Make a scrolling component for use on our homepage website.

Type of change

🆕 Feature

How to Test

yarn storybook

Checklist

• [x] Code follows design and style guidelines
• [x] Code is commented with doc blocks
• [x] Latest code has been rebased from base branch (usually develop)
• [x] Commits follow guidelines (concise, squashed, etc)
• [x] Github issues have been linked in relevant commits
• [x] Relevant reviewers (EM) have been assigned to this PR

Progress

• [x] Component
• [x] Theming
• [x] Tests

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[whymarlene]

I have to add theming but the essential parts of the navigation are there. I will also add tests. Let me know if it needs more customization.

For now, I am planning on:

• Left/right: for the bar of the active section
• length (edit: I don't think length is necessary since there is no bg color)

Open Question: Should there be sub-sections? If so, what would that look like?(Maybe a future feature?)

[whymarlene]

Update: I couldn't really think of any other tests other than the one I made.

Lmk if there is anything I need to change!

[therealsharath]

I'd rename the component to just ScrollNavigation instead of the long name it has rn.