♻️ 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-gfm/index.d.ts

@@ -1,13 +0,0 @@
-import type {Options as MicromarkOptions} from 'micromark-extension-gfm'
-import type {Options as MdastOptions} from 'mdast-util-gfm'
-
-export {default} from './lib/index.js'
-
-/**
- * Configuration for `remark-gfm`.
- *
- * Currently supports `singleTilde` as a parse option and
- * `firstLineBlank`, `stringLength`, `tableCellPadding`, and `tablePipeAlign`
- * as serialization options.
- */
-export interface Options extends MicromarkOptions, MdastOptions {}