fix broken link (#897)

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# Content

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Author: joelaguero

docs/gen/introduction.mdx

@@ -18,7 +18,7 @@ Codegen is an intelligent code agent powered that seamlessly integrates with Sla
 
 # Installation
 
-[Log in with GitHub](https://codegen.sh/start) to install Codegen and set up integrations.
+[Log in with GitHub](https://codegen.sh/install) to install Codegen and set up integrations.
 
 <Card title="Get Started" href={"https://codegen.sh/start"} icon="Gear">
   Install codegen via OAuth with Github, Slack and Linear