♻️ 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
✅ Cookie consent banner included
✅ 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/vfile/lib/minurl.shared.js

@@ -1,31 +0,0 @@
-/**
- * Checks if a value has the shape of a WHATWG URL object.
- *
- * Using a symbol or instanceof would not be able to recognize URL objects
- * coming from other implementations (e.g. in Electron), so instead we are
- * checking some well known properties for a lack of a better test.
- *
- * We use `href` and `protocol` as they are the only properties that are
- * easy to retrieve and calculate due to the lazy nature of the getters.
- *
- * We check for auth attribute to distinguish legacy url instance with
- * WHATWG URL instance.
- *
- * @param {unknown} fileUrlOrPath
- *   File path or URL.
- * @returns {fileUrlOrPath is URL}
- *   Whether it’s a URL.
- */
-// From: <https://github.com/nodejs/node/blob/6a3403c/lib/internal/url.js#L720>
-export function isUrl(fileUrlOrPath) {
-  return Boolean(
-    fileUrlOrPath !== null &&
-      typeof fileUrlOrPath === 'object' &&
-      'href' in fileUrlOrPath &&
-      fileUrlOrPath.href &&
-      'protocol' in fileUrlOrPath &&
-      fileUrlOrPath.protocol &&
-      // @ts-expect-error: indexing is fine.
-      fileUrlOrPath.auth === undefined
-  )
-}