♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
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✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/prismjs/components/prism-yang.min.js

@@ -1 +0,0 @@
-Prism.languages.yang={comment:/\/\*[\s\S]*?\*\/|\/\/.*/,string:{pattern:/"(?:[^\\"]|\\.)*"|'[^']*'/,greedy:!0},keyword:{pattern:/(^|[{};\r\n][ \t]*)[a-z_][\w.-]*/i,lookbehind:!0},namespace:{pattern:/(\s)[a-z_][\w.-]*(?=:)/i,lookbehind:!0},boolean:/\b(?:false|true)\b/,operator:/\+/,punctuation:/[{};:]/};