In the editor, the help text for "Emoji" included a dead link. This
changes the link to a non-dead link.
After changing the JS, assets needed to be recompiled.
Resolves#1775.
Any Capybara-related test setup has been moved to `capybara_helper.rb`.
Now we just must require this file in order to run tests with Capybara.
I also moved the `#console_log` helper to this file to showcase how
other global helper methods could be defined in this file.