Bug/remove-buttons

This PR replaces the nav buttons on the deck view with touch events so that the user can swipe to advance through the cards. This is in addition to swiping on the collection list/view to navigate through decks.

Note: this functionality was already present for the collection slider and was adapted for use with the deck view. It's "no frills" as far as effects go. I also removed the vertical scroll functionality because it was kind of clunky. This means when you swipe up or down, the browser will handle that normally. We'll have to see how that works in practice.

@jazahn Can you review this?

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[FLASH-134](https://jira.huit.harvard.edu/browse/FLASH-134) and [FLASH-136](https://jira.huit.harvard.edu/browse/FLASH-136)