Make an alumni page

[cbrxyz]

We should make a page with a list of lab alumni! It could contain the name, photo, and current organization of each former member!

[brianborrego]

Added the Alumni section to the navbar, see commit a1b2c3d. I'll include a screenshot of the Alumni page here:

I modeled it after the 'Team' page, and for now just included a single card with a picture of Albert Gator as a proof of concept. I added a new folder at src/assets/people/alumni where, similar to the member images, where we'd need to add the images of the alumni.

[cbrxyz]

@brjqn looks great, super excited to see what you're going to do with this! What are the next steps?