♻️ 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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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/remark-stringify/index.d.ts

@@ -1,41 +0,0 @@
-import type {Root} from 'mdast'
-import type {Options as ToMarkdownExtension} from 'mdast-util-to-markdown'
-import type {Plugin} from 'unified'
-import type {Options} from './lib/index.js'
-
-export type {Options} from './lib/index.js'
-
-/**
- * Add support for serializing to markdown.
- *
- * @this
- *   Unified processor.
- * @param
- *   Configuration (optional).
- * @returns
- *   Nothing.
- */
-declare const remarkStringify: Plugin<
-  [(Readonly<Options> | null | undefined)?],
-  Root,
-  string
->
-export default remarkStringify
-
-// Add custom settings supported when `remark-stringify` is added.
-declare module 'unified' {
-  interface Settings extends Options {}
-
-  interface Data {
-    /**
-     * List of `mdast-util-to-markdown` extensions to use.
-     *
-     * This type is registered by `remark-stringify`.
-     * Values can be registered by remark plugins that extend
-     * `mdast-util-to-markdown`.
-     * See {@link ToMarkdownExtension | `Options`} from
-     * {@link https://github.com/syntax-tree/mdast-util-to-markdown#options | `mdast-util-to-markdown`}.
-     */
-    toMarkdownExtensions?: ToMarkdownExtension[]
-  }
-}