♻️ 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/@astrojs/prism/Prism.astro

@@ -1,17 +0,0 @@
----
-import { runHighlighterWithAstro } from './dist/highlighter';
-
-interface Props {
-	class?: string;
-	lang?: string;
-	code: string;
-}
-
-const { class: className, lang, code } = Astro.props as Props;
-const { classLanguage, html } = runHighlighterWithAstro(lang, code);
----
-
-<pre
-	class={[className, classLanguage]
-		.filter(Boolean)
-		.join(' ')}><code class={classLanguage} set:html={html} /></pre>