♻️ 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/micromark/dev/lib/postprocess.js

@@ -1,19 +0,0 @@
-/**
- * @import {Event} from 'micromark-util-types'
- */
-
-import {subtokenize} from 'micromark-util-subtokenize'
-
-/**
- * @param {Array<Event>} events
- *   Events.
- * @returns {Array<Event>}
- *   Events.
- */
-export function postprocess(events) {
-  while (!subtokenize(events)) {
-    // Empty
-  }
-
-  return events
-}