add comment about json stylesheets

include/llmr/style/style.hpp

@@ -21,6 +21,8 @@ public:
     void reset();
     void load(const uint8_t *const data, uint32_t bytes);
 
+    // This is commented out because it is not fully implemented yet. For now,
+    // we keep using the protobuf stylesheet format
     // void loadJSON(const std::string& data);
 
     void cascade(float z);