apps: landing_page: add contributors page

Checklist before submitting MR

• If you changed some Python code, did you format it with black?
• If you changed some frontend, did you check it didn't break anything anywhere? We're not very good at web design, so help us out!

Description

A few sentences describing the overall goals of this MR.

Add a page to thank all the contributors to this project.

List of components affected

• Landing page

Status

• To be squashed
• Changes requested
• Ready for review

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

• Design improvement

• Backend improvement