Fix Read the Docs build

Author: pquentin

.readthedocs.yaml

@@ -0,0 +1,18 @@
+version: 2
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+sphinx:
+  configuration: docs/conf.py
+
+python:
+  install:
+    - method: pip
+      path: .
+      extra_requirements:
+        - docs
+    - method: pip
+      path: sphinx-rtd-theme