Add volatility based dynamic fee hook guide with mdx formatting

[krisoshea-eth]

This PR introduces a comprehensive guide on implementing a Volatility-Based Dynamic Fee Hook in Uniswap V4. This document is written in MDX format, aligning with our documentation standards.

Key Features of the Document:

1. Complete implementation of a volatility-based dynamic fee hook for Uniswap v4
2. Detailed breakdown of the contract structure and key components
3. Explanation of the volatility-based fee structure and thresholds
4. Implementation of the Realized Volatility Oracle interface
5. Detailed explanation of core functions:
   • getFee: Calculates fees based on current volatility
   • beforeSwap: Updates fees before each swap
   • afterInitialize: Sets initial fees for dynamic fee pools
6. Code snippets for each major component of the implementation

Document Structure:

• Uses MDX formatting with frontmatter
• Provides detailed explanations alongside code snippets
• Follows a logical flow from contract structure to individual function implementations

Impact and Importance:

This document offers a concrete example of how to leverage hooks for creating sophisticated, market-responsive fee mechanisms.

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