♻️ 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

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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-editorconfig.min.js

@@ -1 +0,0 @@
-Prism.languages.editorconfig={comment:/[;#].*/,section:{pattern:/(^[ \t]*)\[.+\]/m,lookbehind:!0,alias:"selector",inside:{regex:/\\\\[\[\]{},!?.*]/,operator:/[!?]|\.\.|\*{1,2}/,punctuation:/[\[\]{},]/}},key:{pattern:/(^[ \t]*)[^\s=]+(?=[ \t]*=)/m,lookbehind:!0,alias:"attr-name"},value:{pattern:/=.*/,alias:"attr-value",inside:{punctuation:/^=/}}};