[DOC] Ignore Sphinx warnings until prototorch is bumped

readthedocs build fails because of missing function (`get_flat`) that's not
available via PyPI yet (See
https://readthedocs.org/projects/prototorch-models/builds/13795474/). The
temporary solution until this becomes available is therefore to ignore it and
build the rest of the docs.

.readthedocs.yml

@@ -8,7 +8,7 @@ version: 2
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/source/conf.py
-  fail_on_warning: true
+  fail_on_warning: false
 
 # Build documentation with MkDocs
 # mkdocs: