User Onboarding + Bug Fixes (#1352)

* Bump min supported date to 20 years

* Add basic onboarding

* User onboarding

* Complete onboarding flow

* Cleanup, add user profile update test

app/controllers/onboardings_controller.rb

@@ -0,0 +1,19 @@
+class OnboardingsController < ApplicationController
+  layout "application"
+
+  before_action :set_user
+
+  def show
+  end
+
+  def profile
+  end
+
+  def preferences
+  end
+
+  private
+    def set_user
+      @user = Current.user
+    end
+end