Specify optional additional resources (homepage, blog, <your idea here>)

[therealprof]

Currently we only support specifying a repo which is not ideal to lure in people who're vaguely interested in learning more a team/WG but not necessarily want to wade through the amount and level of details a repo typically provides.

Some teams/WG have dedicated homepages to feature their work and others also frequently blog about it so it would be nice to being able to provide links to that work, too.