feat(v2): debug pages + debug layout + ability to debug content (#3229)

* improve debug plugin:
- add multiple debug pages + debug layout
- ability to debug plugin contentLoaded data

* add missing dependency

* fix broken test

* improve content rendering a bit

* create basic DebugJsonView

* fix ReactJson SSR issues

packages/docusaurus-plugin-content-blog/src/index.ts

@@ -28,7 +28,6 @@ import {
 import {PluginOptionSchema} from './pluginOptionSchema';
 import {
   LoadContext,
-  PluginContentLoadedActions,
   ConfigureWebpackUtils,
   Props,
   Plugin,
@@ -195,13 +194,7 @@ export default function pluginContentBlog(
       };
     },
 
-    async contentLoaded({
-      content: blogContents,
-      actions,
-    }: {
-      content: BlogContent;
-      actions: PluginContentLoadedActions;
-    }) {
+    async contentLoaded({content: blogContents, actions}) {
       if (!blogContents) {
         return;
       }