♻️ 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/mdast-util-to-markdown/lib/handle/code.d.ts

@@ -1,13 +0,0 @@
-/**
- * @param {Code} node
- * @param {Parents | undefined} _
- * @param {State} state
- * @param {Info} info
- * @returns {string}
- */
-export function code(node: Code, _: Parents | undefined, state: State, info: Info): string;
-import type { Code } from 'mdast';
-import type { Parents } from 'mdast';
-import type { State } from 'mdast-util-to-markdown';
-import type { Info } from 'mdast-util-to-markdown';
-//# sourceMappingURL=code.d.ts.map