AST-919 Support ReadTheDocs build
ReadTheDocs output is at https://everybeam.readthedocs.io/en/ast-919-add-readthedocs-build/index.html
Edited by Maik Nijhuis
ReadTheDocs output is at https://everybeam.readthedocs.io/en/ast-919-add-readthedocs-build/index.html