Updated to use mkdocs.

readthedocs.yml

@@ -1,8 +1,15 @@
+# Read the Docs configuration file for MkDocs projects
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+# Required
+version: 2
+# Set the version of Python and other tools you might need
 build:
-  image: latest
-formats:
-  - pdf
-requirements_file: requirements_rtfd.txt
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+mkdocs:
+  configuration: mkdocs.yml
+# Optionally declare the Python requirements required to build your docs
 python:
-  version: 3.6
-  setup_py_install: true
+  install:
+    - requirements: docs/requirements.txt