fix another broken link (#899)

# Motivation

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# Content

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# Testing

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- [ ] I have added tests for my changes
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Author: joelaguero

docs/gen/introduction.mdx

@@ -20,7 +20,7 @@ Codegen is an intelligent code agent powered that seamlessly integrates with Sla
 
 [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">
+<Card title="Get Started" href={"https://codegen.sh/install"} icon="Gear">
   Install codegen via OAuth with Github, Slack and Linear
 </Card>