fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/template/4xx.d.ts

@@ -0,0 +1,18 @@
+interface ErrorTemplateOptions {
+    /** a short description of the error */
+    pathname: string;
+    /** HTTP error code */
+    statusCode?: number;
+    /** HTML <title> */
+    tabTitle: string;
+    /** page title */
+    title: string;
+    /** The body of the message, if one is provided */
+    body?: string;
+}
+/** Display all errors */
+export default function template({ title, pathname, statusCode, tabTitle, body, }: ErrorTemplateOptions): string;
+export declare function subpathNotUsedTemplate(base: string, pathname: string): string;
+export declare function trailingSlashMismatchTemplate(pathname: string, trailingSlash: 'always' | 'never' | 'ignore'): string;
+export declare function notFoundTemplate(pathname: string, message?: string): string;
+export {};