Some refactoring. dev script, graphql dir.

backend/graphql/generate.typings.ts

@@ -0,0 +1,11 @@
+import { GraphQLDefinitionsFactory } from '@nestjs/graphql';
+import { join } from 'path';
+
+const definitionFactory = new GraphQLDefinitionsFactory();
+
+definitionFactory.generate({
+  typePaths: ['./**/*.graphql'],
+  path: join(process.cwd(), 'src/graphql/graphql.typings.ts'),
+  outputAs: 'class',
+  watch: true,
+});