This change removes the twitter authentication feature from the application.
It removes the `omniauth-twitter` gem and all related code from controllers, views, and tests. It also removes the twitter icon and environment variable settings.
* add recaptcha on register view
Update new.html.haml to add it
* Update Gemfile to add recaptcha
* Update env-example to show recaptcha
* More view corrections for recaptcha
* Update registrations_controller.rb to add recaptcha
* Update env-example with test config
* Recaptcha help text
* Fix trailing spaces
* Fix trailing space
* Add Recaptcha to gemfile.lock
* Fixing Gemfile.lock space
* Typo on comments in view
* Update app/views/devise/registrations/new.html.haml
* Fix signup
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Co-authored-by: Cesy <cesy.avon@gmail.com>
