♻️ 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/stringify-entities/lib/util/format-basic.js

@@ -1,9 +0,0 @@
-/**
- * The smallest way to encode a character.
- *
- * @param {number} code
- * @returns {string}
- */
-export function formatBasic(code) {
-  return '&#x' + code.toString(16).toUpperCase() + ';'
-}