feat: Add about page and book image

[kelseymcmahon]

Description

Fixes: #338 #337 #336

Edits:

• Adding some UI updates to the site, including some nicer colors and a slightly nicer navigation UI/UX
• Added an about page
• Added book to about/home pages
• Better mobile nav bar

Would like to create some kind of graphic to fill this area, created a story(#494):

Also, I think I need to update the root css colors to match the parser project side to the added web colors here. There is a bit of a mismatch at the moment on the generated pages.

Ensure that your pull request has followed all the steps below:

• Code compilation
• Created tests which fail without the change (if possible)
• All tests passing
• Extended the README / documentation, if necessary