♻️ 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/retext-latin/index.d.ts

@@ -1,34 +0,0 @@
-import type {Nodes, Paragraph, Root, Sentence} from 'nlcst'
-import type {Plugin} from 'unified'
-
-// See `parse-latin`.
-type Extension<Node extends Nodes> = (node: Node) => undefined | void
-
-/**
- * Add support for parsing Latin-script natural language.
- *
- * @this
- *   Unified processor.
- * @returns
- *   Nothing.
- */
-declare const retextLatin: Plugin<[], string, Root>
-export default retextLatin
-
-// Add custom data supported when `retext-latin` is added.
-declare module 'unified' {
-  interface Data {
-    /**
-     * List of extensions to transform paragraph nodes.
-     */
-    nlcstParagraphExtensions?: Array<Extension<Paragraph>>
-    /**
-     * List of extensions to transform root nodes.
-     */
-    nlcstRootExtensions?: Array<Extension<Root>>
-    /**
-     * List of extensions to transform sentence nodes.
-     */
-    nlcstSentenceExtensions?: Array<Extension<Sentence>>
-  }
-}