build rtd try 3

.readthedocs.yaml

-# readthedocs.yaml
-# RTD configuration file
+# .readthedocs.yaml
+# Read the Docs configuration file
+# 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:
+  os: ubuntu-22.04
+  tools:
+    python: "3.7"
+    # You can also specify other tool versions:
+    # nodejs: "19"
+    # rust: "1.64"
+    # golang: "1.19"
+
+# Build documentation in the docs/ directory with Sphinx
 sphinx:
-    configuration: rtd/source/conf.py
+   configuration: rtd/source/conf.py
+
+# If using Sphinx, optionally build your docs in additional formats such as PDF
+# formats:
+#    - pdf
+
+# Optionally declare the Python requirements required to build your docs
+python:
+   install:
+   - requirements: rtd/requirements.txt
+   - method: pip
+     path: .

rtd/requirements.txt

@@ -3,3 +3,4 @@ sphinx==4.5.0
 sphinx_rtd_theme==1.1.1
 readthedocs-sphinx-search==0.1.1
 sphinx-math-dollar==1.2.1
+myst_parser==0.18.1