♻️ 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/blockquote.js

@@ -1,29 +0,0 @@
-/**
- * @import {Blockquote, Parents} from 'mdast'
- * @import {Info, Map, State} from 'mdast-util-to-markdown'
- */
-
-/**
- * @param {Blockquote} node
- * @param {Parents | undefined} _
- * @param {State} state
- * @param {Info} info
- * @returns {string}
- */
-export function blockquote(node, _, state, info) {
-  const exit = state.enter('blockquote')
-  const tracker = state.createTracker(info)
-  tracker.move('> ')
-  tracker.shift(2)
-  const value = state.indentLines(
-    state.containerFlow(node, tracker.current()),
-    map
-  )
-  exit()
-  return value
-}
-
-/** @type {Map} */
-function map(line, _, blank) {
-  return '>' + (blank ? '' : ' ') + line
-}