Readthedocs build (#313)

* add readthedocs.yaml file

* add build to readthedocs yaml

* modify readthedocs yaml

.readthedocs.yaml

@@ -1,15 +1,16 @@
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
 version: 2
 
-# Set the OS, Python version and other tools you might need
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.7"
+    python: "3"
 
-# Build documentation in the docs/ directory with Sphinx
+python:
+  install:
+    - method: pip
+      path: .
+      extra_requirements:
+        - docs
 sphinx:
   configuration: docs/conf.py
+  fail_on_warning: true