docs: fix url (#127)

Author: vonovak

docs/install.mdx

@@ -13,7 +13,7 @@ Why paid? According to the [State of React Native Survey](https://results.2024.s
 
 [//]: # '🌟'
 
-<CreemEmbeddedCheckout checkoutUrl="https://www.creem.io/checkout/prod_2zElFBVDXGigzZTiK4MvYX/ch_5PmaTQdtYUlCLt08HF0bkE" />
+<CreemEmbeddedCheckout checkoutUrl="https://www.creem.io/payment/prod_2zElFBVDXGigzZTiK4MvYX" />
 
 ### Universal Sign In (premium) {/* #premium */}