♻️ 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

✅ 11 pages built successfully
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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/remark-stringify/lib/index.d.ts

@@ -1,26 +0,0 @@
-/**
- * Add support for serializing to markdown.
- *
- * @param {Readonly<Options> | null | undefined} [options]
- *   Configuration (optional).
- * @returns {undefined}
- *   Nothing.
- */
-export default function remarkStringify(options?: Readonly<Options> | null | undefined): undefined;
-export default class remarkStringify {
-    /**
-     * Add support for serializing to markdown.
-     *
-     * @param {Readonly<Options> | null | undefined} [options]
-     *   Configuration (optional).
-     * @returns {undefined}
-     *   Nothing.
-     */
-    constructor(options?: Readonly<Options> | null | undefined);
-    compiler: (tree: import("mdast").Root, file: import("vfile").VFile) => string;
-}
-export type Root = import('mdast').Root;
-export type ToMarkdownOptions = import('mdast-util-to-markdown').Options;
-export type Compiler = import('unified').Compiler<Root, string>;
-export type Processor = import('unified').Processor<undefined, undefined, undefined, Root, string>;
-export type Options = Omit<ToMarkdownOptions, 'extensions'>;