simplify quickstart step 1 to link directly to create modal

Author: nijikokun

ai-gateway/quickstart.mdx

@@ -10,7 +10,7 @@ You'll need an [ngrok account](https://dashboard.ngrok.com/signup) on the [Pay-a
 
 <Steps>
   <Step title="Create an AI Gateway">
-    Open [AI Gateways](https://dashboard.ngrok.com/ai-gateways) in the dashboard and click [**+ New AI Gateway**](https://dashboard.ngrok.com/ai-gateways/new). Enter a URL for your endpoint (for example, `https://your-ai-gateway.ngrok.app`) and click **Create & Configure**.
+    Open the [New AI Gateway](https://dashboard.ngrok.com/ai-gateways/new) form. Enter a URL for your endpoint (for example, `https://your-ai-gateway.ngrok.app`) and click **Create & Configure**.
   </Step>
 
   <Step title="Purchase Credits">