More RTD edits

.readthedocs.yaml

@@ -10,6 +10,9 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.12"
+  jobs:
+    post_create_environment:
+      - python -m pip install sphinx_rtd_theme
     # You can also specify other tool versions:
     # nodejs: "20"
     # rust: "1.70"