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-shiki.js

@@ -0,0 +1,29 @@
+import { highlightCodeBlocks } from "./highlight.js";
+import { createShikiHighlighter } from "./shiki.js";
+const rehypeShiki = (config, excludeLangs) => {
+  let highlighterAsync;
+  return async (tree) => {
+    highlighterAsync ??= createShikiHighlighter({
+      langs: config?.langs,
+      theme: config?.theme,
+      themes: config?.themes,
+      langAlias: config?.langAlias
+    });
+    const highlighter = await highlighterAsync;
+    await highlightCodeBlocks(
+      tree,
+      (code, language, options) => {
+        return highlighter.codeToHast(code, language, {
+          meta: options?.meta,
+          wrap: config?.wrap,
+          defaultColor: config?.defaultColor,
+          transformers: config?.transformers
+        });
+      },
+      excludeLangs
+    );
+  };
+};
+export {
+  rehypeShiki
+};