♻️ 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/util/check-bullet-other.js

@@ -1,38 +0,0 @@
-/**
- * @import {Options, State} from 'mdast-util-to-markdown'
- */
-
-import {checkBullet} from './check-bullet.js'
-
-/**
- * @param {State} state
- * @returns {Exclude<Options['bullet'], null | undefined>}
- */
-export function checkBulletOther(state) {
-  const bullet = checkBullet(state)
-  const bulletOther = state.options.bulletOther
-
-  if (!bulletOther) {
-    return bullet === '*' ? '-' : '*'
-  }
-
-  if (bulletOther !== '*' && bulletOther !== '+' && bulletOther !== '-') {
-    throw new Error(
-      'Cannot serialize items with `' +
-        bulletOther +
-        '` for `options.bulletOther`, expected `*`, `+`, or `-`'
-    )
-  }
-
-  if (bulletOther === bullet) {
-    throw new Error(
-      'Expected `bullet` (`' +
-        bullet +
-        '`) and `bulletOther` (`' +
-        bulletOther +
-        '`) to be different'
-    )
-  }
-
-  return bulletOther
-}