chore: remove old curriculum bundler

curriculum/create-challenge-bundle.js

@@ -1,6 +0,0 @@
-var fs = require('fs');
-var getChallenges = require('./getChallenges');
-
-var challengeSpecs = getChallenges();
-
-fs.writeFileSync('seed/challenge-bundle.json', JSON.stringify(challengeSpecs));

curriculum/package-entry.js

@@ -1 +0,0 @@
-export { default as getChallenges } from './getChallenges';