fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/remark-gfm/index.d.ts

@@ -0,0 +1,13 @@
+import type {Options as MicromarkOptions} from 'micromark-extension-gfm'
+import type {Options as MdastOptions} from 'mdast-util-gfm'
+
+export {default} from './lib/index.js'
+
+/**
+ * Configuration for `remark-gfm`.
+ *
+ * Currently supports `singleTilde` as a parse option and
+ * `firstLineBlank`, `stringLength`, `tableCellPadding`, and `tablePipeAlign`
+ * as serialization options.
+ */
+export interface Options extends MicromarkOptions, MdastOptions {}