Allow for sync PageFunctions

Author: bcomnes

lib/build-pages/page-builders/page-writer.js

@@ -29,7 +29,7 @@ import { writeFile, mkdir } from 'fs/promises'
  * @param {PageInfo} params.page - Info about the current page
  * @param {PageData<T>[]} params.pages - An array of info about every page
  * @param {Object<string, string>} [params.workers] - Map of worker names to their output paths
- * @returns {Promise<any>} The rendered inner page thats compatible with its matched layout
+ * @returns {Promise<any> | any} The rendered inner page thats compatible with its matched layout
  */
 
 /**