Create prototype app to list all core contributors for a repo

[itsjeyd]

Epic

#134: Improving OSPR Management

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To improve the discoverability of core contributors we'd like to have a mechanism to list all core contributors for a repo.

Build out a simple web app that uses the github API to get a list of all core contributors for a repo, and deploy it to github pages so it can be accessed by anyone in the community.

[xitij2000]

Implemented via: open-craft/core-contributor-browser#1

[itsjeyd]

Blocked waiting for final outcome of #149, see open-craft/core-contributor-browser#1 (comment) for details.