[#77580744] remove rails admin completely
make login screen scrollable, test runner could not find sign up button
Merge pull request #494 from Tahi-project/rails-admin-b-gone

[#77580744] remove rails admin completely
add segment.io and ENV variable
track events on ember view changes

used https://github.com/rahim/ember-segmentio
add Segment.io .gem
push Login event to segment.io
track Logouts
track Paper creations, manuscript uploads, and submissions
WIP; stopping work b/c we dont need server side analytics yet'