feat: make plugins configurable

and set all available as defaults for example

Author: davidenke

src/config.json

@@ -3,6 +3,7 @@
   "excludeElements": ["wcp-root"],
   "initialActiveElement": "wcp-button",
   "initialPreviewTab": "viewer",
+  "previewFramePlugins": ["wcp-preview-frame-examples", "wcp-preview-frame-readme", "wcp-preview-frame-viewer"],
   "additionalReadmeGroupName": "Readme",
   "additionalReadmes": [
     {

src/utils/config.utils.ts

@@ -4,7 +4,12 @@ export type Config = {
   excludeElements: string[];
   fallbackGroupName: string;
   initialActiveElement: string;
-  initialPreviewTab: 'examples' | 'readme' | 'viewer';
+  initialPreviewTab: string;
+  /**
+   * The plugins to be used for the preview frame.
+   * Defaults to `['wcp-preview-frame-viewer', 'wcp-preview-frame-examples', 'wcp-preview-frame-readme']`
+   */
+  previewFramePlugins: string[];
   additionalReadmeGroupName: string;
   additionalReadmes: {
     name: string;