New Settings Menu, Routes and Controllers Organization (#641)

* Add new settings routes and controllers

* Add new settings view, restructure controllers and routes

* Fix lint errors

app/controllers/settings/hostings_controller.rb

@@ -0,0 +1,46 @@
+class Settings::HostingsController < ApplicationController
+  before_action :verify_hosting_mode
+
+  def show
+  end
+
+  def update
+    if all_updates_valid?
+      hosting_params.keys.each do |key|
+        Setting.send("#{key}=", hosting_params[key].strip)
+      end
+
+      redirect_to settings_hosting_path, notice: t(".success")
+    else
+      flash.now[:error] = @errors.first.message
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  private
+    def all_updates_valid?
+      @errors = ActiveModel::Errors.new(Setting)
+      hosting_params.keys.each do |key|
+        setting = Setting.new(var: key)
+        setting.value = hosting_params[key].strip
+
+        unless setting.valid?
+          @errors.merge!(setting.errors)
+        end
+      end
+
+      if hosting_params[:upgrades_mode] == "auto" && hosting_params[:render_deploy_hook].blank?
+        @errors.add(:render_deploy_hook, t("settings.hostings.update.render_deploy_hook_error"))
+      end
+
+      @errors.empty?
+    end
+
+    def hosting_params
+      params.require(:setting).permit(:render_deploy_hook, :upgrades_mode, :upgrades_target)
+    end
+
+    def verify_hosting_mode
+      head :not_found unless self_hosted?
+    end
+end