fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/ohash/dist/crypto/js/index.d.mts

@@ -0,0 +1,10 @@
+/**
+ * Hashes a string using the SHA-256 algorithm and encodes it in Base64URL format.
+ *
+ * @param {string} message - The message to hash.
+ *
+ * @returns {string} The hash of the message.
+ */
+declare function digest(message: string): string;
+
+export { digest };