Moved flavour UI into own prefs tab

app/controllers/settings/flavours_controller.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class Settings::FlavoursController < Settings::BaseController
+
+  def index
+    redirect_to action: 'show', flavour: current_flavour
+  end
+
+  def show
+    unless Themes.instance.flavours.include?(params[:flavour]) or params[:flavour] == current_flavour
+      redirect_to action: 'show', flavour: current_flavour
+    end
+
+    @listing = Themes.instance.flavours
+    @selected = params[:flavour]
+  end
+
+  def update
+    user_settings.update(user_settings_params(params[:flavour]).to_h)
+    redirect_to action: 'show', flavour: params[:flavour]
+  end
+
+  private
+
+  def user_settings
+    UserSettingsDecorator.new(current_user)
+  end
+
+  def user_settings_params(flavour)
+    params.require(:user).merge({ setting_flavour: flavour }).permit(
+      :setting_flavour,
+      :setting_skin
+    )
+  end
+end