Add a Gallery page

[DavidEBest]

Right now, there are a handful of photos on the Contact Us page. These should be moved to a new "Gallery" page.

A complete PR for this should:

• Add a new "Gallery" page that is listed in the header.
• Images should be removed from the "Contact Us" page.
• Gallery should have standard behavior for a gallery (image is shown in a modal rather than linking directly).

[sunidhisachan]

hey @DavidEBest I can try this. Please assign this to me.

[DavidEBest]

@sunidhisachan You've got it! Thanks!

[DavidEBest]

Hey, @sunidhisachan! How's it going on this issue. Do you have any questions?