docs: codegen agent docs (#840)

# Motivation

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# Content

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# Testing

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# Please check the following before marking your PR as ready for review

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Author: jayhack

docs/gen/capabilities.mdx

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+---
+title: "Capabilities"
+icon: "gear"
+---
+
+Codegen is built on an [open-source library](/introduction/overiew.mdx) for code manipulation.
+
+It combines "tools" for code editing with powerful integrations, including Github, Linear and Slack.
+
+<Tip>
+  Learn more about our open source [code agent implementation](/docs/tutorials/build-code-agent)
+</Tip>
+
+## Communication Tools
+
+- **SlackSendMessageTool**: Allows Codegen to send messages in Slack channels and threads, providing responses to your queries and sharing information with your team.
+
+## GitHub Integration Tools
+
+Codegen includes a comprehensive set of GitHub tools:
+
+- **GithubCheckoutPRTool**: Checks out pull requests to your local environment for review and testing.
+
+- **GithubCreatePRTool**: Creates new pull requests from your current branch, including title, description, and target branch.
+
+- **GithubCreatePRCommentTool**: Adds comments to pull requests for feedback and team communication.
+
+- **GithubCreatePRReviewCommentTool**: Provides inline comments on specific code changes within pull requests.
+
+- **GithubEditPRTool**: Modifies existing pull requests, including updating titles, descriptions, and other metadata.
+
+- **GithubSearchIssuesTool**: Searches for GitHub issues based on various criteria like status, assignee, or labels.
+
+- **GithubViewPRTool**: Retrieves and displays information about specific pull requests.
+
+- **GithubViewPRCheckTool**: Checks the status of CI/CD and other automated checks on pull requests.
+
+- **GithubViewCommitHistoryTool**: Shows the commit history of a repository or specific branch.
+
+- **GithubViewCommitTool**: Displays details about specific commits, including changes made.
+
+## Linear Integration Tools (Optional)
+
+For teams using Linear for project management, Codegen offers:
+
+- **LinearGetIssueTool**: Retrieves details about specific Linear issues.
+
+- **LinearGetIssueCommentsTool**: Fetches comments on Linear issues for context and history.
+
+- **LinearCommentOnIssueTool**: Adds comments to Linear issues for team communication.
+
+- **LinearSearchIssuesTool**: Searches for Linear issues based on various criteria.
+
+- **LinearCreateIssueTool**: Creates new issues in Linear with appropriate metadata.
+
+- **LinearGetTeamsTool**: Retrieves information about teams in your Linear organization.
+
+## How Codegen Uses These Tools
+
+Codegen's AI brain (powered by Claude 3.7 Sonnet) intelligently selects and combines these tools to:
+
+1. Understand your requests through natural language in Slack
+2. Determine the most appropriate tools to fulfill your request
+3. Execute the necessary actions across GitHub, Linear, and your codebase
+4. Provide clear, helpful responses back in Slack
+
+This seamless integration allows you to manage your entire development workflow through simple conversations, without having to switch between different platforms and interfaces.
+
+## Getting Started
+
+Ready to experience the power of Codegen? Check out our [Quickstart Guide](/docs/gen/quickstart) to set up Codegen for your team, and explore [Common Commands](/docs/gen/common-commands) to see how to interact with these tools through natural language.

docs/gen/faq.mdx

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+---
+title: "Frequently Asked Questions"
+sidebarTitle: "FAQ"
+icon: "square-question"
+iconType: "solid"
+---
+
+<AccordionGroup>
+  <Accordion title="What model does Codegen use?" icon="code">
+    Claude 3.7. Our code agent is roughly comparable with Claude Code.
+  </Accordion>
+  <Accordion title="Is this free?" icon="scale-balanced">
+    Yes! For now. Get it while it's hot.
+  </Accordion>
+  <Accordion title="Where is my data stored?" icon="database">
+    Codegen stores this data in their private cloud. We are SOC-2 compliant. [Learn more](/introduction/about)
+  </Accordion>
+</AccordionGroup> 

docs/gen/introduction.mdx

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+---
+title: "Codegen: AI Development Assistant"
+sidebarTitle: "Introduction"
+icon: "lightbulb"
+---
+
+Codegen is an intelligent code agent powered that seamlessly integrates with Slack, Github and Linear.
+
+<Frame caption="Communicate with codegen via Slack">
+<img src="/images/codegen-bot-intro.png" />
+</Frame>
+
+<Tip>
+  Explore our [Capabilities](/docs/gen/capabilities) page to learn more about
+  Codegen's full feature set and available tools!
+</Tip>
+
+
+# Installation
+
+[Log in with GitHub](https://codegen.sh/start) 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
+</Card>
+
+# Common Queries
+
+> *Edit repo X so that the user auth flow uses JWT*  
+Modify the authentication flow in a specified repository to use JSON Web Tokens. This ensures secure and stateless authentication.
+
+> *Show me the recent activity on my repo X*  
+Display the latest commits, pull requests, and other activities in a specified repository. This helps you stay updated with ongoing changes.
+
+> *Can you figure out why my tests are failing on `main`?*  
+Analyze the test failures on the main branch to identify potential issues. This assists in maintaining code quality and stability.
+
+> *Can you review my PR?*  
+Perform a code review on a specified pull request, providing feedback and suggestions. This ensures code quality and adherence to best practices.
+
+> *Do we have any tickets about Y?*  
+Search for tickets related to a specific topic or issue. This helps in tracking and managing tasks effectively.
+