♻️ 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/unist-util-modify-children/lib/index.js

@@ -1,68 +0,0 @@
-/**
- * @typedef {import('unist').Node} Node
- * @typedef {import('unist').Parent} Parent
- */
-
-/**
- * @template {Parent} Kind
- *   Node type.
- * @callback Modifier
- *   Callback called for each `child` in `parent` later given to `modify`.
- * @param {Kind['children'][number]} child
- *   Child of `parent`.
- * @param {number} index
- *   Position of `child` in `parent`.
- * @param {Kind} parent
- *   Parent node.
- * @returns {number | undefined | void}
- *   Position to move to next (optional).
- */
-
-/**
- * @template {Parent} Kind
- *   Node type.
- * @callback Modify
- *   Modify children of `parent`.
- * @param {Kind} parent
- *   Parent node.
- * @returns {undefined}
- *   Nothing.
- */
-
-import {arrayIterate} from 'array-iterate'
-
-/**
- * Wrap `modifier` to be called for each child in the nodes later given to
- * `modify`.
- *
- * @template {Parent} Kind
- *   Node type.
- * @param {Modifier<Kind>} modifier
- *   Callback called for each `child` in `parent` later given to `modify`.
- * @returns {Modify<Kind>}
- *   Modify children of `parent`.
- */
-export function modifyChildren(modifier) {
-  return modify
-
-  /** @type {Modify<Kind>} */
-  function modify(parent) {
-    if (!parent || !parent.children) {
-      throw new Error('Missing children in `parent` for `modifier`')
-    }
-
-    arrayIterate(parent.children, iteratee, parent)
-  }
-
-  /**
-   * Pass the context as the third argument to `modifier`.
-   *
-   * @this {Kind}
-   * @param {Node} node
-   * @param {number} index
-   * @returns {number | undefined | void}
-   */
-  function iteratee(node, index) {
-    return modifier(node, index, this)
-  }
-}