Update default plugins and docs (#2265)

* Update default plugins

* Update plugin docs with missing plugin

* Fixed broken link in docs

* Update Code of Conduct in docs

* Fix mixup that both plugins are moderation-actions

* fix: adapt server tests to use the rich text plugin

* fix: e2e

* fix: sync docs

plugins/talk-plugin-notifications-category-reply/README.md

@@ -4,6 +4,7 @@ permalink: /plugin/talk-plugin-notifications-category-reply/
 layout: plugin
 plugin:
     name: talk-plugin-notifications-category-reply
+    default: true
     depends:
         - name: talk-plugin-notifications
     provides:
@@ -12,4 +13,4 @@ plugin:
 ---
 
 Replies made to each user will trigger an email to be sent with the notification
-details if enabled.
+details if enabled.