chore: Add new 'getting started' onboarding document (#2391)

Remove support document
Remove confusing images
Added onboarding checklist

server/models/Team.js

@@ -170,9 +170,9 @@ Team.prototype.provisionFirstCollection = async function (userId) {
   // For the first collection we go ahead and create some intitial documents to get
   // the team started. You can edit these in /server/onboarding/x.md
   const onboardingDocs = [
-    "Support",
     "Integrations & API",
     "Our Editor",
+    "Getting Started",
     "What is Outline",
   ];