Integration
New:
- add Iframe component to embed external pages
- register 3 new routes for home page (/), about page (/about) and professional learning pages (/professional-learning) that embed the respective pages from the drupal build (will work only in forumone environments, because we don't have the drupal pages in our staging site)
- add 404 page for unknown routes
- transform links inside embedded pages to post message to parent window (our app) so that we handle navigation for links inside the app