doc: CSS - fix alignment of code block in figure blocks

BTW: minor profread of reST.rst

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

docs/_themes/searx/static/searx.css

@@ -90,10 +90,16 @@ div.rst-example {
   }
 }
 
+/* code block in figures
+ */
+
+div.highlight pre {
+    text-align: left;
+}
+
 /* Table theme
 */
 
-
 thead, tfoot {
   background-color: #fff;
 }