Junior Developer Profile - links to pull requests

[andrzejkrzywda]

With this issue I'd like to start building a "profile page" for a junior developer. I'm not sure if GitHub already provides such UI, but we want to limit the PRs to the projects that we "support" on our platform as part of this find-mentor idea.

When I review the juniors list, I'd like to click on any of them and see their PRs. It might be just links for now, nothing else. If it can somehow automatically retrieve them via API then cool, but it's also fine if we add them manually.