♻️ 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/mdast-util-to-hast/lib/handlers/root.js

@@ -1,22 +0,0 @@
-/**
- * @import {Parents as HastParents, Root as HastRoot} from 'hast'
- * @import {Root as MdastRoot} from 'mdast'
- * @import {State} from '../state.js'
- */
-
-/**
- * Turn an mdast `root` node into hast.
- *
- * @param {State} state
- *   Info passed around.
- * @param {MdastRoot} node
- *   mdast node.
- * @returns {HastParents}
- *   hast node.
- */
-export function root(state, node) {
-  /** @type {HastRoot} */
-  const result = {type: 'root', children: state.wrap(state.all(node))}
-  state.patch(node, result)
-  return state.applyData(node, result)
-}