♻️ 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/check-rule.d.ts

@@ -1,11 +0,0 @@
-/**
- * @import {Options, State} from 'mdast-util-to-markdown'
- */
-/**
- * @param {State} state
- * @returns {Exclude<Options['rule'], null | undefined>}
- */
-export function checkRule(state: State): Exclude<Options["rule"], null | undefined>;
-import type { State } from 'mdast-util-to-markdown';
-import type { Options } from 'mdast-util-to-markdown';
-//# sourceMappingURL=check-rule.d.ts.map