[fix] sphinx-tabs should not overlap sidebar

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

docs/_themes/searx/static/searx.css

@@ -138,3 +138,7 @@ caption {
   caption-side: top;
   text-align: left;
 }
+
+div.sphinx-tabs {
+    clear: both;
+}