improve readthedocs config

.readthedocs.yaml

@@ -4,3 +4,12 @@ build:
   os: "ubuntu-20.04"
   tools:
     python: "3.8"
+
+sphinx:
+  fail_on_warning: true
+
+python:
+  # Install our python package before building the docs
+  install:
+    - method: pip
+      path: .