Better eslint configuration and format some files

src/utils/config.ts

@@ -20,7 +20,7 @@ export interface MetaDataConfig extends Omit<MetaData, 'title'> {
 export interface I18NConfig {
   language: string;
   textDirection: string;
-  dateFormatter: unknown;
+  dateFormatter?: Intl.DateTimeFormat;
 }
 export interface AppBlogConfig {
   isEnabled: boolean;