feat: scaffold initial Cheatsheet Hub application

This commit establishes the foundational structure for the Cheatsheet Hub project.

It includes the setup of a Vue 3, Vite, and TailwindCSS stack, along with core application features:

- **Routing:** Configures `vue-router` for Home, Cheatsheet List, and Cheatsheet Detail pages.
- **State Management:** Implements a `pinia` store for theme management (dark/light mode) and mock data.
- **UI Components:** Adds reusable components like `NavBar`, `CheatsheetCard`, and `PrintButton`.
- **Styling:** Integrates TailwindCSS with custom base styles, dark mode support, and print-friendly optimizations.
- **Dependencies:** Adds key libraries including `marked` for content rendering.

tailwind.config.js

@@ -0,0 +1,24 @@
+// tailwind.config.js
+export default {
+  content: ['./index.html', './src/**/*.{vue,js,ts,jsx,tsx}'],
+  theme: {
+    extend: {
+      colors: {
+        primary: {
+          50: '#eff6ff',
+          100: '#dbeafe',
+          200: '#bfdbfe',
+          300: '#93c5fd',
+          400: '#60a5fa',
+          500: '#3b82f6',
+          600: '#2563eb', // This defines bg-primary-600
+          700: '#1d4ed8',
+          800: '#1e40af',
+          900: '#1e3a8a',
+        },
+      },
+    },
+  },
+  plugins: [],
+  darkMode: 'class',
+}