As usually this is the place where we keep the organisation web site. Anything you put here, in the master branch, is reflected at http://ebibiosamples.github.io/.
Moreover, we also use this repository as...
There is a special POM project, which you can use to deploy your own projects here. See instructions directly inside that POM. In order to link projects deployed in here, you just need to link the repo root in your dependant POM.
Have fun! :-)