Add comprehensive Notion integration documentation

docs/integrations/notion.mdx

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+---
+title: "Notion Integration"
+sidebarTitle: "Notion"
+icon: "book"
+---
+
+Integrate Codegen with your Notion workspace to allow agents to interact with pages, databases, and blocks for comprehensive knowledge management and documentation.
+
+<img src="/images/notion.png" />
+
+## Installation
+
+Connect your Notion workspace to Codegen to enable agent interactions with your knowledge base.
+
+<Card
+  title="Connect Notion Workspace"
+  icon="pencil"
+  href="https://codegen.sh/settings"
+>
+  Authorize Codegen to access your Notion workspace via OAuth integration.
+</Card>
+
+<Note>
+  OAuth access allows agents to interact with pages, databases, and blocks according to
+  your permissions in Notion.
+</Note>
+
+## Capabilities
+
+The Notion integration provides comprehensive read and write access, enabling agents to manage knowledge effectively:
+
+### Search & Discovery
+- **Search Workspace:** Find pages, databases, or blocks matching specific queries
+- **Browse Structure:** Navigate through page hierarchies and database relationships
+
+### Page Management
+- **Read Pages:** Retrieve page details, properties, and content
+- **Create Pages:** Generate new pages in databases or as child pages
+- **Update Pages:** Modify page properties and metadata
+
+### Database Operations
+- **Query Databases:** Retrieve records with filtering and sorting capabilities
+- **Database Schema:** Access database structure and property definitions
+- **Record Management:** Create and update database entries
+
+### Block-Level Content
+- **Read Blocks:** Access individual content blocks (paragraphs, headings, lists, etc.)
+- **Content Creation:** Append new blocks to pages or existing content
+- **Content Updates:** Modify existing block content and formatting
+- **Content Deletion:** Remove specific blocks when needed
+
+### Collaboration Features
+- **Comments:** Read and create comments on pages and discussions
+- **User Management:** Access workspace user information and permissions
+
+## How Agents Use Notion
+
+Agents leverage the Notion integration to enhance documentation and knowledge management workflows:
+
+### Documentation Automation
+- **API Documentation:** Automatically generate and update API docs from code changes
+- **Process Documentation:** Create step-by-step guides based on code implementations
+- **Knowledge Base Updates:** Keep technical documentation synchronized with codebase changes
+
+### Project Management
+- **Status Updates:** Update project pages with development progress
+- **Task Documentation:** Create detailed task breakdowns and implementation notes
+- **Meeting Notes:** Generate structured meeting notes with action items
+
+### Knowledge Sharing
+- **Code Explanations:** Create detailed explanations of complex code sections
+- **Architecture Docs:** Maintain up-to-date system architecture documentation
+- **Onboarding Materials:** Generate and update team onboarding documentation
+
+### Data Integration
+- **Database Synchronization:** Keep Notion databases updated with external data sources
+- **Report Generation:** Create automated reports and dashboards
+- **Content Migration:** Transfer and organize content between different systems
+
+## Example Use Cases
+
+### Automated Documentation Updates
+When code changes are made, agents can automatically update corresponding Notion pages with new API endpoints, parameter changes, or implementation details.
+
+### Project Status Tracking
+Agents can update project databases with current sprint progress, completed features, and upcoming milestones based on GitHub activity.
+
+### Knowledge Base Maintenance
+As new features are developed, agents can create comprehensive documentation pages with examples, best practices, and troubleshooting guides.
+
+### Team Collaboration
+Agents can facilitate team communication by creating structured meeting notes, action item tracking, and progress summaries in shared Notion workspaces.
+