♻️ 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/decode-named-character-reference/index.js

@@ -1,19 +0,0 @@
-import {characterEntities} from 'character-entities'
-
-// To do: next major: use `Object.hasOwn`.
-const own = {}.hasOwnProperty
-
-/**
- * Decode a single character reference (without the `&` or `;`).
- * You probably only need this when you’re building parsers yourself that follow
- * different rules compared to HTML.
- * This is optimized to be tiny in browsers.
- *
- * @param {string} value
- *   `notin` (named), `#123` (deci), `#x123` (hexa).
- * @returns {string|false}
- *   Decoded reference.
- */
-export function decodeNamedCharacterReference(value) {
-  return own.call(characterEntities, value) ? characterEntities[value] : false
-}