docs: Update badges code in README (#3670)

Update badges text code to match the real examples.

Author: mabdelaal86

README.md

@@ -145,9 +145,9 @@ badges:
 [![Powered by Flame](https://img.shields.io/badge/Powered%20by-%F0%9F%94%A5-272727.svg?style=for-the-badge)](https://flame-engine.org)
 
 ```txt
-[![Powered by Flame](https://img.shields.io/badge/Powered%20by-%F0%9F%94%A5-orange.svg)](https://flame-engine.org)
-[![Powered by Flame](https://img.shields.io/badge/Powered%20by-%F0%9F%94%A5-orange.svg?style=flat-square)](https://flame-engine.org)
-[![Powered by Flame](https://img.shields.io/badge/Powered%20by-%F0%9F%94%A5-orange.svg?style=for-the-badge)](https://flame-engine.org)
+[![Powered by Flame](https://img.shields.io/badge/Powered%20by-%F0%9F%94%A5-272727.svg)](https://flame-engine.org)
+[![Powered by Flame](https://img.shields.io/badge/Powered%20by-%F0%9F%94%A5-272727.svg?style=flat-square)](https://flame-engine.org)
+[![Powered by Flame](https://img.shields.io/badge/Powered%20by-%F0%9F%94%A5-272727.svg?style=for-the-badge)](https://flame-engine.org)
 ```