fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/@shikijs/engine-javascript/dist/engine-raw.d.mts

@@ -0,0 +1,12 @@
+import { RegexEngine } from '@shikijs/types';
+
+/**
+ * Raw JavaScript regex engine that only supports precompiled grammars.
+ *
+ * This further simplifies the engine by excluding the regex compilation step.
+ *
+ * Zero dependencies.
+ */
+declare function createJavaScriptRawEngine(): RegexEngine;
+
+export { createJavaScriptRawEngine };