Fix RTD configuration

Author: therve

.readthedocs.yml

@@ -1,16 +1,21 @@
-# .readthedocs.yml
+# .readthedocs.yaml
 # Read the Docs configuration file
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 
 # Required
 version: 2
 
-# Build documentation with MkDocs
-mkdocs:
-  configuration: mkdocs.yml
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.10"
 
-# Optionally set the version of Python and requirements required to build your docs
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+   configuration: docs/conf.py
+
+# Optionally declare the Python requirements required to build your docs
 python:
-  version: 3.7
-  install:
-    - requirements: docs/requirements.txt
+   install:
+   - requirements: docs/requirements.txt