Update RTD configuration (#224)

Author: No767

.readthedocs.yaml

@@ -3,11 +3,11 @@ version: 2
 build:
   os: ubuntu-24.04
   tools:
-    python: "3.13"
+    python: "3.12"
+  commands:
+    - python -m pip install --upgrade -r docs/requirements.txt
+    - python -m sphinx -aEnTW --builder html --keep-going docs/ $READTHEDOCS_OUTPUT/html
 
 sphinx:
    configuration: docs/conf.py
-
-python:
-   install:
-   - requirements: docs/requirements.txt
+   fail_on_warning: true