♻️ 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/micromark-extension-gfm-strikethrough/dev/lib/html.d.ts

@@ -1,13 +0,0 @@
-/**
- * @import {HtmlExtension} from 'micromark-util-types'
- */
-/**
- * Create an HTML extension for `micromark` to support GFM strikethrough when
- * serializing to HTML.
- *
- * @returns {HtmlExtension}
- *   Extension for `micromark` that can be passed in `htmlExtensions`, to
- *   support GFM strikethrough when serializing to HTML.
- */
-export function gfmStrikethroughHtml(): HtmlExtension;
-import type { HtmlExtension } from 'micromark-util-types';