section1/ntbk.html
https://mybinder.org/v2/git/https%3A//opensource.ncsa.illinois.edu/bitbucket/scm/u3d/3dutilities/foo?urlpath=tree/docs/section1/ntbk.ipynb
https://hub.myorg.edu/hub/user-redirect/git-pull?repo=https%3A//opensource.ncsa.illinois.edu/bitbucket/scm/u3d/3dutilities&urlpath=tree/3dutilities/docs/section1/ntbk.ipynb&branch=foo
section1/ntbkmd.html
https://mybinder.org/v2/git/https%3A//opensource.ncsa.illinois.edu/bitbucket/scm/u3d/3dutilities/foo?urlpath=tree/docs/section1/ntbkmd.md
https://hub.myorg.edu/hub/user-redirect/git-pull?repo=https%3A//opensource.ncsa.illinois.edu/bitbucket/scm/u3d/3dutilities&urlpath=tree/3dutilities/docs/section1/ntbkmd.md&branch=foo