Remove legacy articles IDs

Author: eandreeva-twr

src/data/sidebars/tutorial.json

@@ -663,21 +663,6 @@
         "id": "paywall-dark-mode",
         "label": "Dark mode"
       },
-      {
-        "id": "get-paid-in-onboardings",
-        "type": "doc",
-        "label": "Connect paywalls to onboardings"
-      },
-      {
-        "id": "target-onboardings-to-different-user-groups",
-        "type": "doc",
-        "label": "Target different user groups"
-      },
-      {
-        "id": "localize-onboardings",
-        "type": "doc",
-        "label": "Localize onboarding"
-      },
       {
         "type": "category",
         "label": "Localization",