Rafacto put everything user related in the user module + test

src/app/app.component.ts

src/app/app.module.ts

src/app/core/components/contact/contact.component.spec.ts

src/app/core/components/contact/contact.component.ts

src/app/core/components/index.ts

src/app/core/components/main/header/header.component.spec.ts

...p/core/components/main/side-menu/side-menu.component.html

...ore/components/main/side-menu/side-menu.component.spec.ts

...app/core/components/main/side-menu/side-menu.component.ts

src/app/core/core-routing.module.ts

src/app/core/core.module.ts

src/app/core/handlers/errors-handler.ts

src/app/core/models/auth.model.ts

src/app/core/models/index.ts

src/app/core/services/auth.service.ts

src/app/core/services/index.ts

src/app/routes.ts

src/app/user/components/auth/login/login.component.html

src/app/user/components/auth/login/login.component.scss

src/app/user/components/auth/login/login.component.spec.ts