♻️ 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-hast/lib/handlers/html.js

@@ -1,28 +0,0 @@
-/**
- * @import {Element} from 'hast'
- * @import {Html} from 'mdast'
- * @import {State} from '../state.js'
- * @import {Raw} from '../../index.js'
- */
-
-/**
- * Turn an mdast `html` node into hast (`raw` node in dangerous mode, otherwise
- * nothing).
- *
- * @param {State} state
- *   Info passed around.
- * @param {Html} node
- *   mdast node.
- * @returns {Element | Raw | undefined}
- *   hast node.
- */
-export function html(state, node) {
-  if (state.options.allowDangerousHtml) {
-    /** @type {Raw} */
-    const result = {type: 'raw', value: node.value}
-    state.patch(node, result)
-    return state.applyData(node, result)
-  }
-
-  return undefined
-}