exercise recommendations lost on refresh

[bxie]

this.state.exerciseRecommendations is initialized to empty on refresh, so recommendations need to repopulate (either via local storage or otherwise)

functions which eventually update state.exerciseRecommendations in App.js submitResponse() -> checkAnswer() -> verifyUserAnswer() -> setFeedback() -> modelUpdater.update() -> updateRecommendation()

submitResponse() is passed into ExerciseView as submitHandler

[bxie]

we likely want to log what's recommended (compare selection to recommendation), so likely best course of action is this:

1. check if stored in React state
2. (check if) logged in sessionStorage
3. (check if) logged in firebase User collection

[bxie]

recommended exercises now stores in Users/Data/AnswerSubmissions 18668825ec6ff55f7554a9adb2e3298ff2ba64ac

[bxie]

fixed in d0f37af099aab6e00c518e723cd3c931fcb9e0a8