fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/@astrojs/markdown-remark/dist/import-plugin-default.js

@@ -0,0 +1,24 @@
+import path from "node:path";
+import { pathToFileURL } from "node:url";
+import { resolve as importMetaResolve } from "import-meta-resolve";
+let cwdUrlStr;
+async function importPlugin(p) {
+  try {
+    const importResult2 = await import(
+      /* @vite-ignore */
+      p
+    );
+    return importResult2.default;
+  } catch {
+  }
+  cwdUrlStr ??= pathToFileURL(path.join(process.cwd(), "package.json")).toString();
+  const resolved = importMetaResolve(p, cwdUrlStr);
+  const importResult = await import(
+    /* @vite-ignore */
+    resolved
+  );
+  return importResult.default;
+}
+export {
+  importPlugin
+};