Deprecate 3.12 (#55505)

Co-authored-by: mc <42146119+mchammer01@users.noreply.github.com>
Co-authored-by: Felicity Chapman <felicitymay@github.com>
Co-authored-by: Sarah Schneider <sarahs@github.com>

content/graphql/index.md

@@ -12,7 +12,6 @@ featuredLinks:
   popular:
     - /graphql/overview/explorer
     - /graphql/overview/public-schema
-    - /graphql/overview/schema-previews
     - /graphql/guides/using-pagination-in-the-graphql-api
   guideCards:
     - /graphql/guides/migrating-from-rest-to-graphql
@@ -23,6 +22,7 @@ changelog:
 layout: product-landing
 redirect_from:
   - /v4
+  - /graphql/overview/schema-previews
 versions:
   fpt: '*'
   ghec: '*'