[Completes #43683787 #42974977] Edit app button says 'Create...' and Developer can see additional app information on app description page relevant to them as being owner of the app

 - update design/layout on /apps, /apps/new, /apps/edit and /apps/:slug
[Fixes #43880485] Client secret is saved in the session between calls
[Completes #42974945] Admin can promote a sandboxed app
[Completes #43714691] Update branding on email-logo.png to MyUSA