message: Change label to Log In / Sign Up
diff: <li><a class="log-reg" (click)="authSvc.logout()" *ngIf="authSvc.authenticated()">Log Out</a></li>
  </ul>
  </li>
  - <li class="nav-link-container"><a class="log-reg nav-link " (click)="authSvc.login()" *ngIf="!authSvc.authenticated()"><span>Log In</span></a></li>
  + <li class="nav-link-container"><a class="log-reg nav-link " (click)="authSvc.login()" *ngIf="!authSvc.authenticated()"><span>Log In / Sign Up</span></a></li>
  </ul>
  </div>
  </nav>
  