fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/content/vite-plugin-content-imports.d.ts

@@ -0,0 +1,9 @@
+import type fsMod from 'node:fs';
+import type { Plugin } from 'vite';
+import type { Logger } from '../core/logger/core.js';
+import type { AstroSettings } from '../types/astro.js';
+export declare function astroContentImportPlugin({ fs, settings, logger, }: {
+    fs: typeof fsMod;
+    settings: AstroSettings;
+    logger: Logger;
+}): Plugin[];