♻️ 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/@astrojs/markdown-remark/dist/load-plugins.js

@@ -1,22 +0,0 @@
-import { importPlugin as _importPlugin } from "#import-plugin";
-async function importPlugin(p) {
-  if (typeof p === "string") {
-    return await _importPlugin(p);
-  } else {
-    return p;
-  }
-}
-function loadPlugins(items) {
-  return items.map((p) => {
-    return new Promise((resolve, reject) => {
-      if (Array.isArray(p)) {
-        const [plugin, opts] = p;
-        return importPlugin(plugin).then((m) => resolve([m, opts])).catch((e) => reject(e));
-      }
-      return importPlugin(p).then((m) => resolve([m])).catch((e) => reject(e));
-    });
-  });
-}
-export {
-  loadPlugins
-};