refactor: remove unused GraphQL server files, update schema handling, and improve file organization

Author: manudous

06-rest-api/03-graphql/02-crud/02-graphql-frontend/.babelrc

@@ -6,6 +6,6 @@ test-report.*
 junit.xml
 *.log
 *.orig
-package-lock.json
 yarn.lock
 .awcache
+.DS_Store