♻️ 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-string/lib/index.d.ts

@@ -1,31 +0,0 @@
-/**
- * Get the text content of a node or list of nodes.
- *
- * Prefers the node’s plain-text fields, otherwise serializes its children,
- * and if the given value is an array, serialize the nodes in it.
- *
- * @param {unknown} [value]
- *   Thing to serialize, typically `Node`.
- * @param {Options | null | undefined} [options]
- *   Configuration (optional).
- * @returns {string}
- *   Serialized `value`.
- */
-export function toString(
-  value?: unknown,
-  options?: Options | null | undefined
-): string
-export type Nodes = import('mdast').Nodes
-/**
- * Configuration (optional).
- */
-export type Options = {
-  /**
-   * Whether to use `alt` for `image`s (default: `true`).
-   */
-  includeImageAlt?: boolean | null | undefined
-  /**
-   * Whether to use `value` of HTML (default: `true`).
-   */
-  includeHtml?: boolean | null | undefined
-}