Add an about:contributors page

[bsclifton]

Carried over from brave/browser-laptop#7828

Brave is a really unique project and we have a lot of great folks contributing to this project 🦁

We should be offering an about page (ex: about:contributors) to honor and give credit to all the folks who have contributed time and effort to the project. It's important to call out folks that helped with any aspect of the project:

• Community management
• Issue triage
• Code
• Testing
• Translations
• other

Code or project contribution information can be pulled from GitHub fairly easy, while other information (translations, triage, etc) is doesn't have a rock solid way to characterize or collect stats for. Some of the information may need to be manually collected