Add support for highlighting python based on the nix highlighter.

src/context/src_block.rs

@@ -63,6 +63,13 @@ render!(RenderSrcBlock, ISrcBlock, original, render_context, {
                 .unwrap()
                 .include_css("language_nix.css")?;
         }
+        Some("python") => {
+            render_context
+                .dependency_manager
+                .lock()
+                .unwrap()
+                .include_css("language_python.css")?;
+        }
         _ => {}
     };
     Ok(RenderSrcBlock {