Add RTD configs to get generator working

docs/readthedocs.yaml

@@ -0,0 +1,17 @@
+# Configuration for RTDs generation
+
+version: 2
+
+build:
+  os: "ubuntu-20.04"
+  tools:
+    python: "3.7"
+
+# Build from the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/conf.py
+
+# Explicitly set the version of Python and its requirements
+python:
+  install:
+    - requirements: docs/requirements.txt

docs/requirements.txt

@@ -0,0 +1,4 @@
+# Defining the exact versions for ReadTheDocs that will make sure things don't break
+sphinx==4.2.0
+sphinx_rtd_theme==1.0.0
+readthedocs-sphinx-search==0.1.1