Implement custom webform css setting

https://netnode.atlassian.net/jira/software/c/projects/RP/boards/321?assignee=6310d13d3e578bb3b5fec34e&selectedIssue=SOL-372

src/Form/NodeHiveSettingsForm.php

@@ -120,6 +120,15 @@ class NodeHiveSettingsForm extends ConfigFormBase {
       ),
     ];
 
+    $form['editor_experience']['webform_styles_url'] = [
+      '#type' => 'url',
+      '#title' => $this->t('Webform Styles URL'),
+      '#default_value' => $config->get('webform_styles_url'),
+      '#description' => $this->t(
+        'Example: https://www.yourfrontend.com/webform.css'
+      ),
+    ];
+
     // Section 2: Regional settings.
     $form['regional_settings'] = [
       '#type' => 'details',
@@ -203,6 +212,7 @@ class NodeHiveSettingsForm extends ConfigFormBase {
     // Save the configuration.
     $this->config('nodehive_core.settings')
       ->set('company_name', $form_state->getValue('company_name'))
+      ->set('webform_styles_url', $form_state->getValue('webform_styles_url'))
       ->set('ckeditor_styles_url', $ckeditor_styles_url)
       ->save();