Update .readthedocs.yaml w/newly required fields (#805)

* update .readthedocs.yaml w/new required fields

* add html_context to conf.py

* add sphinx_rtd_theme to extensions

* add requirements.txt doc

.readthedocs.yml

@@ -4,6 +4,10 @@
 
 # Required
 version: 2
+build: 
+  os: ubuntu-20.04
+  tools: 
+    python: "3.9"
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
@@ -17,8 +21,7 @@ sphinx:
 formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
-#python:
+python:
 #  version: 3.7
-#  install:
-
-#    - requirements: docs/requirements.txt
+  install:
+    - requirements: docs/requirements.txt

docs/conf.py

@@ -31,6 +31,7 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
+    'sphinx_rtd_theme',
     'sphinx.ext.autosectionlabel'
 ]
 autosectionlabel_prefix_document = True
@@ -69,6 +70,7 @@
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
+html_context = {}
 
 # Add custom style sheets
 def setup(app):

docs/requirements.txt

@@ -0,0 +1,3 @@
+sphinxcontrib-bibtex
+sphinx_rtd_theme
+docutils==0.16