♻️ 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-markdown/lib/handle/paragraph.js

@@ -1,20 +0,0 @@
-/**
- * @import {Info, State} from 'mdast-util-to-markdown'
- * @import {Paragraph, Parents} from 'mdast'
- */
-
-/**
- * @param {Paragraph} node
- * @param {Parents | undefined} _
- * @param {State} state
- * @param {Info} info
- * @returns {string}
- */
-export function paragraph(node, _, state, info) {
-  const exit = state.enter('paragraph')
-  const subexit = state.enter('phrasing')
-  const value = state.containerPhrasing(node, info)
-  subexit()
-  exit()
-  return value
-}