Move Video challenges under challenges dir

Remove old hikes components
Remove unused jobs stuff

common/app/routes/challenges/redux/index.js

@@ -5,11 +5,13 @@ export types from './types';
 import fetchChallengesSaga from './fetch-challenges-saga';
 import completionSaga from './completion-saga';
 import nextChallengeSaga from './next-challenge-saga';
+import answerSaga from './answer-saga';
 
 export projectNormalizer from './project-normalizer';
 
 export const sagas = [
   fetchChallengesSaga,
   completionSaga,
-  nextChallengeSaga
+  nextChallengeSaga,
+  answerSaga
 ];