message: Remove `alt` for logo
  (to avoid spoilers)
diff: <nav class="navbar navbar-default" role="navigation">
  <div class="container-fluid" ng-controller="NavbarController">
  <div class="navbar-header">
  - <a href="#/"><img class="navbar-brand navbar-logo" src="/public/images/JuiceShop_Logo.png" alt="Juice Shop Logo"></a><a class="navbar-brand" href="#/"><span ng-bind="applicationName"></span> <small ng-bind="version"></small></a>
  + <a href="#/"><img class="navbar-brand navbar-logo" src="/public/images/JuiceShop_Logo.png"></a><a class="navbar-brand" href="#/"><span ng-bind="applicationName"></span> <small ng-bind="version"></small></a>
  </div>
  <ul class="nav navbar-nav navbar-right">
  <li class="dropdown" ng-show="!isLoggedIn()">
  