fix CE defines

src/common/folk-element.ts

@@ -0,0 +1,10 @@
+// will eventually extend Lit's ReactiveElement
+export class FolkElement extends HTMLElement {
+  static tagName = '';
+
+  static define() {
+    if (customElements.get(this.tagName)) return;
+
+    customElements.define(this.tagName, this);
+  }
+}