fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/remark-stringify/lib/index.d.ts

@@ -0,0 +1,26 @@
+/**
+ * Add support for serializing to markdown.
+ *
+ * @param {Readonly<Options> | null | undefined} [options]
+ *   Configuration (optional).
+ * @returns {undefined}
+ *   Nothing.
+ */
+export default function remarkStringify(options?: Readonly<Options> | null | undefined): undefined;
+export default class remarkStringify {
+    /**
+     * Add support for serializing to markdown.
+     *
+     * @param {Readonly<Options> | null | undefined} [options]
+     *   Configuration (optional).
+     * @returns {undefined}
+     *   Nothing.
+     */
+    constructor(options?: Readonly<Options> | null | undefined);
+    compiler: (tree: import("mdast").Root, file: import("vfile").VFile) => string;
+}
+export type Root = import('mdast').Root;
+export type ToMarkdownOptions = import('mdast-util-to-markdown').Options;
+export type Compiler = import('unified').Compiler<Root, string>;
+export type Processor = import('unified').Processor<undefined, undefined, undefined, Root, string>;
+export type Options = Omit<ToMarkdownOptions, 'extensions'>;