Merge pull request #250 from consideRatio/pr/modernize-ci

ci: stop test build of docs on circleci, update RTD config

Author: consideRatio

.circleci/config.yml

@@ -0,0 +1,19 @@
+# Configuration on how ReadTheDocs (RTD) builds our documentation
+# ref: https://readthedocs.org/projects/mybinder/
+# ref: https://docs.readthedocs.io/en/stable/config-file/v2.html
+#
+version: 2
+
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.9"
+
+sphinx:
+  configuration: doc/conf.py
+
+formats: []
+
+python:
+  install:
+    - requirements: doc/doc-requirements.txt