enable users to choose via css to display teiHeader if they wish to do so

packages/cwrc-leafwriter/src/js/schema/schemaManager.ts

@@ -781,7 +781,7 @@ class SchemaManager {
 
     // hide the header
     const tagName = this.getTagForEditor(this.header);
-    schemaTags += `${tagName} [_tag=${this.header}] { display: none !important; }`;
+    schemaTags += `${tagName} [_tag=${this.header}] { display: none; }`;
 
     $('#schemaTags', this.writer.editor?.getDoc()).text(schemaTags);