fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/mdast-util-to-markdown/lib/handle/html.d.ts

@@ -0,0 +1,15 @@
+/**
+ * @param {Html} node
+ * @returns {string}
+ */
+export function html(node: Html): string;
+export namespace html {
+    export { htmlPeek as peek };
+}
+import type { Html } from 'mdast';
+/**
+ * @returns {string}
+ */
+declare function htmlPeek(): string;
+export {};
+//# sourceMappingURL=html.d.ts.map