task: update codeowners to list only APIx Integrations team (#438)

Author: wtrocki

.github/CODEOWNERS

@@ -1,10 +1,10 @@
 # Maintained by the API experience team
-* @mongodb/apix1 @mongodb/APIx-Integrations
+* @mongodb/APIx-Integrations
 
 # All docs
 /docs @mongodb/docs-cloud-team
 
 # Docs exemptions
-/docs/docs @mongodb/apix1 @mongodb/APIx-Integrations
-/docs/doc_last_reference.md @mongodb/apix1 @mongodb/APIx-Integrations
-/docs/README.md @mongodb/apix1 @mongodb/APIx-Integrations
+/docs/docs @mongodb/APIx-Integrations
+/docs/doc_last_reference.md @mongodb/APIx-Integrations
+/docs/README.md @mongodb/APIx-Integrations