refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

node_modules/@astrojs/markdown-remark/dist/rehype-collect-headings.d.ts

@@ -0,0 +1,11 @@
+import type { RehypePlugin } from './types.js';
+/**
+ * Rehype plugin that adds `id` attributes to headings based on their text content.
+ *
+ * @param options Optional configuration object for the plugin.
+ *
+ * @see https://docs.astro.build/en/guides/markdown-content/#heading-ids-and-plugins
+ */
+export declare function rehypeHeadingIds({ experimentalHeadingIdCompat, }?: {
+    experimentalHeadingIdCompat?: boolean;
+}): ReturnType<RehypePlugin>;