♻️ 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/format-code-as-indented.js

@@ -1,22 +0,0 @@
-/**
- * @import {State} from 'mdast-util-to-markdown'
- * @import {Code} from 'mdast'
- */
-
-/**
- * @param {Code} node
- * @param {State} state
- * @returns {boolean}
- */
-export function formatCodeAsIndented(node, state) {
-  return Boolean(
-    state.options.fences === false &&
-      node.value &&
-      // If there’s no info…
-      !node.lang &&
-      // And there’s a non-whitespace character…
-      /[^ \r\n]/.test(node.value) &&
-      // And the value doesn’t start or end in a blank…
-      !/^[\t ]*(?:[\r\n]|$)|(?:^|[\r\n])[\t ]*$/.test(node.value)
-  )
-}