(docs) Rename Apollo Graph Manager service to Apollo Studio. Update links and desc

Author: setchy

src/content/code/services/apollo-graph-manager.md

@@ -0,0 +1,8 @@
+---
+name: Apollo Studio
+description: A cloud service that helps you build, validate, monitor and secure your organizations data graph.
+url: https://www.apollographql.com/docs/studio/
+github: apollographql/apollo-studio-community
+---
+
+