Remove readthedocs.yml because it's not helping

docs/readthedocs.yml

@@ -1,20 +0,0 @@
-# See http://read-the-docs.readthedocs.io/en/latest/yaml-config.html
-
-# When I used rtd-build to build the docs locally, it complained
-# that there was a missing key "name"
-name: BigchainDB
-type: sphinx
-
-# Build HTML zip, PDF & ePub
-formats:
-    - htmlzip
-    - epub
-    - pdf
-
-requirements_file: docs/requirements.txt
-
-python:
-   version: 3
-   setup_py_install: true
-
-# Use the default of pip_install