Enable documentation autobuilds on Readthedocs

[andersy005]

Towards fixing #16 by taking advantage of https://docs.readthedocs.io/en/stable/guides/autobuild-docs-for-pull-requests.html

[andersy005]

For this to properly work, someone with admin privileges needs to approve Readthedocs OAuth access to the organization wide settings. I am unable to do this myself since I lack the needed permissions

[clyne]

Done

[andersy005]

Thank you, @clyne