add autosave config

app/javascript/application.js

@@ -228,6 +228,7 @@ safeRegisterElement('template-builder', class extends HTMLElement {
       template,
       customFields: reactive(JSON.parse(this.dataset.customFields || '[]')),
       dateFormats: JSON.parse(this.dataset.dateFormats || '[]'),
+      autosave: this.dataset.autosave !== 'false',
       dynamicDocuments: reactive(JSON.parse(this.dataset.dynamicDocuments || '[]')),
       backgroundColor: '#faf7f5',
       locale: this.dataset.locale,