🎨 Improved post-setup onboarding flow (#19996)

ref https://linear.app/tryghost/issue/IPC-66/onboarding-checklist-v1

- replaced the setup/done screen with a new onboarding checklist shown on the dashboard

ghost/core/core/shared/labs.js

@@ -24,7 +24,8 @@ const GA_FEATURES = [
     'listUnsubscribeHeader',
     'filterEmailDisabled',
     'newEmailAddresses',
-    'portalImprovements'
+    'portalImprovements',
+    'onboardingChecklist'
 ];
 
 // NOTE: this allowlist is meant to be used to filter out any unexpected
@@ -50,7 +51,6 @@ const ALPHA_FEATURES = [
     'lexicalIndicators',
     // 'adminXOffers',
     'adminXDemo',
-    'onboardingChecklist',
     'membersSpamPrevention'
 ];
 

ghost/core/test/e2e-api/admin/__snapshots__/settings.test.js.snap

@@ -1155,7 +1155,7 @@ exports[`Settings API Edit Can edit a setting 2: [headers] 1`] = `
 Object {
   "access-control-allow-origin": "http://127.0.0.1:2369",
   "cache-control": "no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0",
-  "content-length": "4562",
+  "content-length": "4591",
   "content-type": "application/json; charset=utf-8",
   "content-version": StringMatching /v\\\\d\\+\\\\\\.\\\\d\\+/,
   "etag": StringMatching /\\(\\?:W\\\\/\\)\\?"\\(\\?:\\[ !#-\\\\x7E\\\\x80-\\\\xFF\\]\\*\\|\\\\r\\\\n\\[\\\\t \\]\\|\\\\\\\\\\.\\)\\*"/,