♻️ 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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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

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

dealplustech-astro/node_modules/decode-named-character-reference/index.dom.js

@@ -1,32 +0,0 @@
-/// <reference lib="dom" />
-
-/* global document */
-
-const element = document.createElement('i')
-
-/**
- * @param {string} value
- * @returns {string | false}
- */
-export function decodeNamedCharacterReference(value) {
-  const characterReference = '&' + value + ';'
-  element.innerHTML = characterReference
-  const character = element.textContent
-
-  // Some named character references do not require the closing semicolon
-  // (`&not`, for instance), which leads to situations where parsing the assumed
-  // named reference of `&notit;` will result in the string `¬it;`.
-  // When we encounter a trailing semicolon after parsing, and the character
-  // reference to decode was not a semicolon (`&semi;`), we can assume that the
-  // matching was not complete.
-  if (
-    character.charCodeAt(character.length - 1) === 59 /* `;` */ &&
-    value !== 'semi'
-  ) {
-    return false
-  }
-
-  // If the decoded string is equal to the input, the character reference was
-  // not valid.
-  return character === characterReference ? false : character
-}