docs: adds integrations page and points to the right places

docs/gen/integrations.mdx

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+---
+title: 'Integrations'
+description: 'Integrate Codegen with your favorite tools and platforms'
+icon: 'puzzle-piece'
+---
+
+<Card
+  title="Install Codegen + Set Up Integrations"
+  icon="puzzle-piece"
+  href="https://codegen.sh/install"
+>
+  Get started with Codegen integrations by installing the CLI
+</Card>
+
+## Available Integrations
+
+### GitHub
+
+Codegen integrates seamlessly with GitHub, allowing you to:
+- Run automated code reviews
+- Manage pull requests
+- Analyze codebases
+- Automate code modifications at scale
+
+### Slack
+
+Connect Codegen with Slack to:
+- Receive notifications about code changes
+- Run code analysis directly from Slack
+- Get instant feedback on pull requests
+- Collaborate with your team on code reviews
+
+### Linear
+
+Our Linear integration enables you to:
+- Link code changes to issues
+- Automatically update ticket status
+- Track code modifications across projects
+- Streamline your development workflow
+
+## Coming Soon
+
+We're actively working on integrations with:
+- Sentry
+- Vercel
+- Modal
+- And more!
+
+Stay tuned for updates or [join our community](/introduction/community) to request new integrations.