♻️ 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/code.js

@@ -1,49 +0,0 @@
-/**
- * @import {Element, Properties} from 'hast'
- * @import {Code} from 'mdast'
- * @import {State} from '../state.js'
- */
-
-/**
- * Turn an mdast `code` node into hast.
- *
- * @param {State} state
- *   Info passed around.
- * @param {Code} node
- *   mdast node.
- * @returns {Element}
- *   hast node.
- */
-export function code(state, node) {
-  const value = node.value ? node.value + '\n' : ''
-  /** @type {Properties} */
-  const properties = {}
-  // Someone can write `js python	ruby`.
-  const language = node.lang ? node.lang.split(/\s+/) : []
-
-  // GH/CM still drop the non-first languages.
-  if (language.length > 0) {
-    properties.className = ['language-' + language[0]]
-  }
-
-  // Create `<code>`.
-  /** @type {Element} */
-  let result = {
-    type: 'element',
-    tagName: 'code',
-    properties,
-    children: [{type: 'text', value}]
-  }
-
-  if (node.meta) {
-    result.data = {meta: node.meta}
-  }
-
-  state.patch(node, result)
-  result = state.applyData(node, result)
-
-  // Create `<pre>`.
-  result = {type: 'element', tagName: 'pre', properties: {}, children: [result]}
-  state.patch(node, result)
-  return result
-}