v2.1.0

Changes

Remove external tooling dependencies from skills. Skills now provide pure patterns and best practices without requiring users to install specific tools or libraries.

feature-slicing

• Remove Steiger linter references and config
• Remove ESLint configuration examples
• Update Next.js pattern to use src/app/ for App Router (no root app/ folder)

postgres-drizzle

• Remove npm install instructions from Quick Start

mermaid-diagrams

• Remove Integration Tips section (VS Code extension, Docusaurus setup)