♻️ 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
✅ Cookie consent banner included
✅ 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/unist-util-modify-children/lib/index.d.ts

@@ -1,30 +0,0 @@
-/**
- * Wrap `modifier` to be called for each child in the nodes later given to
- * `modify`.
- *
- * @template {Parent} Kind
- *   Node type.
- * @param {Modifier<Kind>} modifier
- *   Callback called for each `child` in `parent` later given to `modify`.
- * @returns {Modify<Kind>}
- *   Modify children of `parent`.
- */
-export function modifyChildren<Kind extends import('unist').Parent>(
-  modifier: Modifier<Kind>
-): Modify<Kind>
-export type Node = import('unist').Node
-export type Parent = import('unist').Parent
-/**
- * Callback called for each `child` in `parent` later given to `modify`.
- */
-export type Modifier<Kind extends import('unist').Parent> = (
-  child: Kind['children'][number],
-  index: number,
-  parent: Kind
-) => number | undefined | void
-/**
- * Modify children of `parent`.
- */
-export type Modify<Kind extends import('unist').Parent> = (
-  parent: Kind
-) => undefined