feat: add password-reset handling

src/app/app-routing.module.ts

src/app/app.module.ts

src/app/reset-password/reset-password.component.html

src/app/reset-password/reset-password.component.spec.ts

src/app/reset-password/reset-password.component.ts

src/app/services/auth.service.ts

...hared/components/signup-modal/signup-modal.component.html

.../shared/components/signup-modal/signup-modal.component.ts