Change OSEM config variables to MORAGA

[davidsf]

This is a fork of the great OSEM software, so we need to change the name to MORAGA in the codebase.

First step is to change the config variables:

docker-compose.yml.production-example
dotenv.example
Gemfile
Gemfile.next
INSTALL.md
app/helpers/users_helper.rb
app/helpers/application_helper.rb
app/models/admin_ability.rb
app/models/email_settings.rb
app/models/user.rb
app/models/ability.rb
app/views/conferences/new_install.html.haml
app/views/conferences/show.html.haml
app/views/proposals/new.html.haml
app/views/proposals/show.html.haml
app/views/conference_registrations/new.html.haml
app/views/conference_registrations/edit.html.haml
app/views/layouts/_user_menu.html.haml
app/views/layouts/application.html.haml
app/views/layouts/_navigation.html.haml
app/views/devise/sessions/_new_embedded.html.haml
app/views/payments/_payment.html.haml
config/piwik.yml
config/database.yml
config/routes.rb
config/environments/development.rb
config/environments/production.rb
config/deploy.rb
config/application.rb
config/initializers/sentry.rb
config/initializers/devise.rb
lib/tasks/migrate_config.rake
spec/controllers/conference_registration_controller_spec.rb
spec/spec_helper.rb
spec/helpers/application_helper_spec.rb
spec/routing/routing_spec.rb
spec/support/omniauth_macros.rb

[linuxonrails]

I see that it has been changed for configuration variables. Should this issue be closed?

But I find other results by searching for OSEM in the code:

• CODE_OF_CONDUCT.md
• CONTRIBUTING.md
• Docker images belongs to osem.
• CSS files (app/assets/stylesheets/application.css)
  etc

Could you update the issue with the changes @davidsf? I'll make all the changes.