chore: backport retro compatible commits for the Docusaurus v2.2 release (#8264)

Co-authored-by: Jan Peer Stoecklmair <jan.peer.stoecklmair@dynatrace.com>
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Author: 23 people

admin/new.docusaurus.io/package.json

@@ -1,6 +1,6 @@
 {
   "name": "new.docusaurus.io",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "private": true,
   "scripts": {
     "start": "npx --package netlify-cli netlify dev"

lerna.json

@@ -1,5 +1,5 @@
 {
-  "version": "2.1.0",
+  "version": "2.2.0",
   "npmClient": "yarn",
   "useWorkspaces": true,
   "changelog": {