remove obsolete section

.readthedocs.yml

@@ -5,16 +5,19 @@
 # Required
 version: 2
 
+build:
+    os: "ubuntu-22.04"
+    tools:
+        python: "3.10"
+
 # Build documentation in the doc/ directory with Sphinx
 sphinx:
     configuration: doc/conf.py
-    fail_on_warning: true
 
 # Optionally build your docs in additional formats such as PDF and ePub
-formats: all
+# formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-    version: "3.10"
     install:
-      - requirements: doc/rtd-requirements.txt
+        - requirements: doc/rtd-requirements.txt