♻️ 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/to-decimal.js

@@ -1,16 +0,0 @@
-const decimalRegex = /\d/
-
-/**
- * Configurable ways to encode characters as decimal references.
- *
- * @param {number} code
- * @param {number} next
- * @param {boolean|undefined} omit
- * @returns {string}
- */
-export function toDecimal(code, next, omit) {
-  const value = '&#' + String(code)
-  return omit && next && !decimalRegex.test(String.fromCharCode(next))
-    ? value
-    : value + ';'
-}