update readthedocs.yml

.readthedocs.yml

@@ -12,19 +12,19 @@ sphinx:
   # disabled but this also means those errors will fail silently, choose wisely.
   fail_on_warning: true
 
-# Build documentation with MkDocs
-#mkdocs:
-#  configuration: mkdocs.yml
-
 # Optionally build your docs in additional formats such as PDF and ePub
-formats: all
+formats: []
 
-# Optionally set the version of Python and requirements required to build your docs
-#python:
-#  version: 3.6
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "mambaforge-22.9"
 
 conda:
   environment: environment-docs.yml
 
-build:
-  image: stable
+# Optionally set the version of Python and requirements required to build your docs
+# python:
+#  install:
+#    - requirements: requirements_docs.txt