migrate to new format required for readthedocs.io

.readthedocs.yml

@@ -3,19 +3,20 @@
 
 version: 2
 
-# Build documentation in the docs/ directory with Sphinx
+# Set the OS, Python version and other tools you might need
+build:
+    os: ubuntu-22.04
+    tools:
+        python: "3.10"
+
+# Build documentation in the "docs/" directory with Sphinx
 sphinx:
     configuration: docs/conf.py
 
-# Build documentation with MkDocs
-#mkdocs:
-#  configuration: mkdocs.yml
-
 # Optionally build your docs in additional formats such as PDF and ePub
 formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-    version: 3.8
     install:
         - requirements: docs/requirements.txt