♻️ 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/rehype-raw/lib/index.d.ts

@@ -1,16 +0,0 @@
-/**
- * Parse the tree (and raw nodes) again, keeping positional info okay.
- *
- * @param {Options | null | undefined}  [options]
- *   Configuration (optional).
- * @returns
- *   Transform.
- */
-export default function rehypeRaw(options?: Options | null | undefined): (tree: Root, file: VFile) => Root;
-export type Root = import('hast').Root;
-export type RawOptions = import('hast-util-raw').Options;
-export type VFile = import('vfile').VFile;
-/**
- * Configuration.
- */
-export type Options = Omit<RawOptions, 'file'>;