Code graph _analysis_ docs (#272)

We agreed in the private slack to call it code graph analysis everywhere. Or at least, we preliminarily agreed on something of that nature. Putting up the docs here until we agree actually

Co-authored-by: Howon Lee <[email protected]>

Author: howonlee

Diff for: docs/integrations/code-graph-analysis.md

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+---
+title: Code Graph Analysis
+description: Learn about CodeRabbit's intelligent graph-based code analysis.
+sidebar_label: Code Graph Analysis
+sidebar_position: 6
+---
+
+# CodeRabbit Code Graph Analysis
+
+## What is Code Graph Analysis?
+
+Code Graph Analysis is an intelligent code analysis feature that enhances your code reviews by automatically mapping relationships between files in your codebase. By
+understanding how your code connects and interacts, Code Graph provides concrete snippets of context that makes reviews more effective and insightful.
+
+## How Code Graph Analysis Enhances Your Reviews
+
+When reviewing code with CodeRabbit, Code Graph Analysis automatically:
+
+- **Maps symbol definitions and references** across your entire codebase
+- **Analyzes commit history** to identify files that frequently change together
+- **Builds relationship graphs** showing how different parts of your code connect
+- **Enriches reviews with contextual information** about related code
+
+Code Graph Analysis is also available in the CodeRabbit Chat. CodeRabbit Chat will automatically analyze your codebase with it when the agent deems it necessary.
+
+## Key Features
+
+### Three Types of Contextual Information
+
+Code Graph Analysis adds three powerful layers of context to your reviews:
+
+1. **Definition Files**: Files containing definitions that are referenced in the current code
+2. **Reference Files**: Files that reference symbols defined in the current code
+3. **Related Files**: Files that appear related based on usage patterns and commit history
+
+### Language Support
+
+Code Graph Analysis works with:
+
+- Bash
+- C
+- C#
+- C++
+- CSS
+- Elixir
+- Go
+- Java
+- JavaScript
+- Kotlin
+- Lua
+- PHP
+- Python
+- Ruby
+- Rust
+- Scala
+- Swift
+- TSX
+- TypeScript
+
+## Availability
+
+Code Graph Analysis is available on the Lite tier and above.
+
+---
+
+Learn more about CodeRabbit's advanced features at [coderabbit.ai](https://coderabbit.ai)