[WIP] Add section for community contributors

[GeckoEidechse]

Adds a list of all contributions over all repos in R2Northstar and R2NorthstarTools.

TODOs:

• Adjust CSS for community contributors to decrease icon size
• Decide whether to split up R2Northstar and R2NortharTools into two categories
• Randomise list on ever page load so that there's no implied ranking or the like
  (it's super hard to do proper ranking cause e.g. commit count wouldn't work cause NorthstarProton is based on Proton resulting in Proton contributors always being counted as top even though in terms of Northstar there contributions might be less important than contributions to e.g. NorthstarLauncher)

Requires

• Load credits from JSON files #44
  Uses
• Add script to scrape GitHub for contributors #45

[GeckoEidechse]

Obsoleted with #75 and #45