Make branding configurable (#173)

* Remove orphan function

* Add centralized branding helpers and update locales

* Remove _plus and add (proper) brand

* No longer Sure, configurable

* Consistency with compose file naming

* Missed `product_name` mapping

* Fix brand/product name in mailers

* Product name in email reset flow

* Fix i18n errors/tests

* Fix password mailer brand/product name (again)

* Missed hardcoded `Sure` in onboarding goals

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: Juan José Mata <jjmata@jjmata.com>

* PR nitpick on documentation

* Missing interpolation key for invited UI

* Orphan assets

* New logos

---------

Signed-off-by: Juan José Mata <jjmata@jjmata.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

app/helpers/application_helper.rb

@@ -1,6 +1,14 @@
 module ApplicationHelper
   include Pagy::Frontend
 
+  def product_name
+    Rails.configuration.x.product_name
+  end
+
+  def brand_name
+    Rails.configuration.x.brand_name
+  end
+
   def styled_form_with(**options, &block)
     options[:builder] = StyledFormBuilder
     form_with(**options, &block)