♻️ 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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✅ 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/util/format-code-as-indented.d.ts

@@ -1,13 +0,0 @@
-/**
- * @import {State} from 'mdast-util-to-markdown'
- * @import {Code} from 'mdast'
- */
-/**
- * @param {Code} node
- * @param {State} state
- * @returns {boolean}
- */
-export function formatCodeAsIndented(node: Code, state: State): boolean;
-import type { Code } from 'mdast';
-import type { State } from 'mdast-util-to-markdown';
-//# sourceMappingURL=format-code-as-indented.d.ts.map