config file for RTD

docs/doc-requirements.txt

@@ -1,6 +1,3 @@
-mne
-graphviz
-pygraphviz
 sphinx>=1.4, !=1.5.4
 jupyter_alabaster_theme
 recommonmark

readthedocs.yml

@@ -0,0 +1,5 @@
+name: repo2docker
+type: sphinx
+python:
+  version: 3
+requirements_file: doc/doc-requirements.txt