♻️ 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/handle/html.js

@@ -1,20 +0,0 @@
-/**
- * @import {Html} from 'mdast'
- */
-
-html.peek = htmlPeek
-
-/**
- * @param {Html} node
- * @returns {string}
- */
-export function html(node) {
-  return node.value || ''
-}
-
-/**
- * @returns {string}
- */
-function htmlPeek() {
-  return '<'
-}