fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/stringify-entities/lib/core.d.ts

@@ -0,0 +1,26 @@
+/**
+ * Encode certain characters in `value`.
+ *
+ * @param {string} value
+ * @param {CoreWithFormatOptions} options
+ * @returns {string}
+ */
+export function core(value: string, options: CoreWithFormatOptions): string;
+export type CoreOptions = {
+    /**
+     * Whether to only escape the given subset of characters.
+     */
+    subset?: ReadonlyArray<string>;
+    /**
+     * Whether to only escape possibly dangerous characters.
+     * Those characters are `"`, `&`, `'`, `<`, `>`, and `` ` ``.
+     */
+    escapeOnly?: boolean;
+};
+export type FormatOptions = {
+    /**
+     *  Format strategy.
+     */
+    format: (code: number, next: number, options: CoreWithFormatOptions) => string;
+};
+export type CoreWithFormatOptions = CoreOptions & FormatOptions & import('./util/format-smart.js').FormatSmartOptions;