fix: Updated mcp.json and host.json to support streamable http - Fixes #46

[dbarkol]

Description

Updated the MCP server instructions in host.json to replace placeholder text with comprehensive usage instructions for Snippy's AI-powered code snippet tools.

Changes

• Replaced "Some test instructions on how to use the server" with detailed MCP tool descriptions
• Added clear descriptions for save_snippet, get_snippet, code_style, and deep_wiki tools
• Included parameter guidance and usage instructions for better user experience

Testing

• Verified host.json syntax is valid
• Confirmed MCP server instructions are comprehensive and accurate

Fixes #46