♻️ 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/markdown-remark/dist/highlight.d.ts

@@ -1,16 +0,0 @@
-import type { Root } from 'hast';
-type Highlighter = (code: string, language: string, options?: {
-    meta?: string;
-}) => Promise<Root | string>;
-export declare const defaultExcludeLanguages: string[];
-/**
- * A hast utility to syntax highlight code blocks with a given syntax highlighter.
- *
- * @param tree
- *   The hast tree in which to syntax highlight code blocks.
- * @param highlighter
- *   A function which receives the code and language, and returns the HTML of a syntax
- *   highlighted `<pre>` element.
- */
-export declare function highlightCodeBlocks(tree: Root, highlighter: Highlighter, excludeLanguages?: string[]): Promise<void>;
-export {};