Merge OpenSearch-related changes.
diff --git a/Doc/tools/sphinxext/layout.html b/Doc/tools/sphinxext/layout.html
new file mode 100644
index 0000000..689cbda
--- /dev/null
+++ b/Doc/tools/sphinxext/layout.html
@@ -0,0 +1,5 @@
+{% extends "!layout.html" %}
+{% block rootrellink %}
+<li><img src="{{ pathto('_static/py.png', 1) }}" alt="" style="vertical-align: middle; margin-top: -1px"/></li>
+{{ super() }}
+{% endblock %}