Use 'Topics' in all our repos and use them to populate the README here.

Then we wouldn't have to do anything to the .Rmd file when we add new repositories, just re-render and push

https://developer.github.com/v3/orgs/teams/#list-team-repos

https://help.github.com/articles/classifying-your-repository-with-topics/

https://help.github.com/articles/searching-repositories/#search-within-a-users-or-organizations-repositories

https://help.github.com/articles/searching-repositories/#search-by-repository-topic