chore: Add display manifest to whitelabel settings (#8708)

- Adds display manifest to white label settings
- Improve the app config rendering with options for display name and description

lib/config_loader.rb

@@ -26,12 +26,13 @@ class ConfigLoader
     reconcile_feature_config
   end
 
-  private
-
   def general_configs
+    @config_path ||= Rails.root.join('config')
     @general_configs ||= YAML.safe_load(File.read("#{@config_path}/installation_config.yml")).freeze
   end
 
+  private
+
   def account_features
     @account_features ||= YAML.safe_load(File.read("#{@config_path}/features.yml")).freeze
   end