♻️ 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/micromark-util-decode-string/index.js

@@ -1,45 +0,0 @@
-import { decodeNamedCharacterReference } from 'decode-named-character-reference';
-import { decodeNumericCharacterReference } from 'micromark-util-decode-numeric-character-reference';
-const characterEscapeOrReference = /\\([!-/:-@[-`{-~])|&(#(?:\d{1,7}|x[\da-f]{1,6})|[\da-z]{1,31});/gi;
-
-/**
- * Decode markdown strings (which occur in places such as fenced code info
- * strings, destinations, labels, and titles).
- *
- * The “string” content type allows character escapes and -references.
- * This decodes those.
- *
- * @param {string} value
- *   Value to decode.
- * @returns {string}
- *   Decoded value.
- */
-export function decodeString(value) {
-  return value.replace(characterEscapeOrReference, decode);
-}
-
-/**
- * @param {string} $0
- *   Match.
- * @param {string} $1
- *   Character escape.
- * @param {string} $2
- *   Character reference.
- * @returns {string}
- *   Decoded value
- */
-function decode($0, $1, $2) {
-  if ($1) {
-    // Escape.
-    return $1;
-  }
-
-  // Reference.
-  const head = $2.charCodeAt(0);
-  if (head === 35) {
-    const head = $2.charCodeAt(1);
-    const hex = head === 120 || head === 88;
-    return decodeNumericCharacterReference($2.slice(hex ? 2 : 1), hex ? 16 : 10);
-  }
-  return decodeNamedCharacterReference($2) || $0;
-}