Chore: Add display name to the user (#1067)

* Chore: Adding browser info to web widget triggered event

fixes: #970

* Chore: Rename nickname to display name

references: #972

* Chore: Change nickname in code

* chore: fix errors

* Chore: update nginx config

fixes: #1057

* Chore: Fix specs

db/migrate/20200719171437_rename_nick_name_to_display_name.rb

@@ -0,0 +1,5 @@
+class RenameNickNameToDisplayName < ActiveRecord::Migration[6.0]
+  def change
+    rename_column :users, :nickname, :display_name
+  end
+end