♻️ 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

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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/hast-util-to-html/lib/omission/util/siblings.d.ts

@@ -1,36 +0,0 @@
-/**
- * Find applicable siblings in a direction.
- *
- * @template {Parents} Parent
- *   Parent type.
- * @param {Parent | undefined} parent
- *   Parent.
- * @param {number | undefined} index
- *   Index of child in `parent`.
- * @param {boolean | undefined} [includeWhitespace=false]
- *   Whether to include whitespace (default: `false`).
- * @returns {Parent extends {children: Array<infer Child>} ? Child | undefined : never}
- *   Child of parent.
- */
-export function siblingAfter<Parent extends Parents>(parent: Parent | undefined, index: number | undefined, includeWhitespace?: boolean | undefined): Parent extends {
-    children: Array<infer Child>;
-} ? Child | undefined : never;
-/**
- * Find applicable siblings in a direction.
- *
- * @template {Parents} Parent
- *   Parent type.
- * @param {Parent | undefined} parent
- *   Parent.
- * @param {number | undefined} index
- *   Index of child in `parent`.
- * @param {boolean | undefined} [includeWhitespace=false]
- *   Whether to include whitespace (default: `false`).
- * @returns {Parent extends {children: Array<infer Child>} ? Child | undefined : never}
- *   Child of parent.
- */
-export function siblingBefore<Parent extends Parents>(parent: Parent | undefined, index: number | undefined, includeWhitespace?: boolean | undefined): Parent extends {
-    children: Array<infer Child>;
-} ? Child | undefined : never;
-import type { Parents } from 'hast';
-//# sourceMappingURL=siblings.d.ts.map