create deleteUser

+type Mutation {
+  deleteUser(email: String!): Boolean!
+}

+import { isAuthenticated, prisma } from "../../../utils";
+
+export default {
+  Mutation: {
+    deleteUser: async (_, args, { request }) => {
+      isAuthenticated(request);
+      const { email } = args;
+      return prisma.user.delete({
+        where: {
+          email,
+        },
+      });
+    },
+  },
+};