Remove 'Try RTL Online' badge from README

Removed the 'Try RTL Online' badge from the README.

Author: panda-ptr

README.md

@@ -151,8 +151,6 @@ At a high level, every registered C++ type is encapsulated as an `rtl::Record`.
 [![RTL Syntax & Semantics](https://img.shields.io/badge/Doc-Syntax_&_Semantics-blueviolet)](./docs/RTL_SYNTAX_AND_SEMANTICS.md)
  
 [![Benchmark Summary](https://img.shields.io/badge/Doc-Benchmark%20Summary-teal)](./docs/benchmark_summary.md)
- 
-[![Try RTL Online](https://img.shields.io/badge/Try-RTL%20Online-f48024?logo=github&logoColor=white)](https://github.com/codespaces/new?repo=ReflectCxx/RTL-Demo&quickstart=1)
 
 ### How to Build (Windows / Linux)
 ```sh