Update links in footer

[teresalee99]

Currently, all the links in the footers open the UCLA homepage. However, in the same way we want to open the GitHub page by clicking on GitHub in the footer, we have to change the links for the rest of the footer items accordingly. For example, clicking on About Us should open an About Us page (which hasn't been created).

So first, we need to make these pages:

1. About Us Page
2. Donation site (buy me a coffee? paypal?)
3. Linktree to our LinkedIns
   (and any others that we may add in the future)

Then we have to link those pages to the corresponding text in the Footer.

[teresalee99]

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