♻️ 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/container-phrasing.d.ts

@@ -1,19 +0,0 @@
-/**
- * Serialize the children of a parent that contains phrasing children.
- *
- * These children will be joined flush together.
- *
- * @param {PhrasingParents} parent
- *   Parent of flow nodes.
- * @param {State} state
- *   Info passed around about the current state.
- * @param {Info} info
- *   Info on where we are in the document we are generating.
- * @returns {string}
- *   Serialized children, joined together.
- */
-export function containerPhrasing(parent: PhrasingParents, state: State, info: Info): string;
-import type { PhrasingParents } from '../types.js';
-import type { State } from 'mdast-util-to-markdown';
-import type { Info } from 'mdast-util-to-markdown';
-//# sourceMappingURL=container-phrasing.d.ts.map