Update About.html to include other apps using Yalies

[davidtjeong]

Description

Fixes #230

Added the list of other apps that use Yalies.io, including links, to the About page. The list of apps was obtained directly from the home page that shows up prior to logging in. Note: some of the links don't work but they're still there

Include screenshots and/or videos!

Checklist

• [x] I have thoroughly tested my code
• [x] I have considered security and privacy implications of my changes
• [x] I have added one other developer, @ErikBoesen, and the Yalies Team Lead as Reviewers

[ericyoondotcom]

Oh, thanks Erik! Was about to check this one out