♻️ 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/@astrojs/markdown-remark/dist/rehype-collect-headings.d.ts

@@ -1,11 +0,0 @@
-import type { RehypePlugin } from './types.js';
-/**
- * Rehype plugin that adds `id` attributes to headings based on their text content.
- *
- * @param options Optional configuration object for the plugin.
- *
- * @see https://docs.astro.build/en/guides/markdown-content/#heading-ids-and-plugins
- */
-export declare function rehypeHeadingIds({ experimentalHeadingIdCompat, }?: {
-    experimentalHeadingIdCompat?: boolean;
-}): ReturnType<RehypePlugin>;