feat(FE): remove required validator due to missing complexity, add simple email validator

Author: Manuel Proß

web/src/helpers/validators.ts

@@ -1,3 +1,4 @@
-export const isRequiredValidator = (value: string) => {
-    return value ? undefined : 'Required';
+export const getMailValidation = (email: string) => {
+    const regEx = /\S+@\S+\.\S+/;
+    return regEx.test(email) ? undefined : 'Invalid email address';
 };