update cr badge link (#55)

Author: hasit

README.md

@@ -1,6 +1,6 @@
 # AST-GREP Essentials
 
-![CodeRabbit Reviews](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fapi.coderabbit.ai%2Freviews%3Fprovider%3Dgithub%26org%3Dcoderabbitai%26repo%3Dast-grep-essentials&query=%24.reviews&suffix=%20Reviews&style=flat&label=CodeRabbit&labelColor=%23FF570A&color=%2325BAB1&link=https%3A%2F%2Fapp.coderabbit.ai%2Flogin)
+[![CodeRabbit Reviews](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fapi.coderabbit.ai%2Freviews%3Fprovider%3Dgithub%26org%3Dcoderabbitai%26repo%3Dast-grep-essentials&query=%24.reviews&suffix=%20Reviews&style=flat&label=CodeRabbit&labelColor=%23FF570A&color=%2325BAB1)](https://app.coderabbit.ai/login)
 
 ## Overview