update readthedoc config

Author: kunwuz

docs/.readthedocs.yaml

@@ -8,6 +8,12 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.11"
-  commands:
-    - pip install sphinx_rtd_theme
+
+python:
+  install:
+    - method: pip
+      path: .
+    - method: pip
+      extra_requirements:
+        - sphinx_rtd_theme