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-comment-content/README.md

@@ -4,7 +4,6 @@ permalink: /plugin/talk-plugin-comment-content/
 layout: plugin
 plugin:
     name: talk-plugin-comment-content
-    default: true
     provides:
         - Client
 ---
@@ -12,4 +11,4 @@ plugin:
 Pluginizes the text of a comment to support custom treatment of this text. This
 plugin currently parses the given text to see if it contains a link, and makes
 them clickable using
-[react-linkify](https://www.npmjs.com/package/react-linkify).
+[react-linkify](https://www.npmjs.com/package/react-linkify).