Switched emails to being mandetory for users

ref #93

src/seeds/SeedUsers.ts

@@ -33,6 +33,7 @@ export default class SeedUsers implements Seeder {
         initialUser.lastname = "demo";
         initialUser.username = "demo";
         initialUser.password = "demo";
+        initialUser.email = "demo@dev.lauf-fuer-kaya.de"
         initialUser.groups = group;
         return await connection.getRepository(User).save(await initialUser.toEntity());
     }