flashcard list view (individual deck view)

connect deck view to reviewing flashcards as a user, when I click into a deck, I want to be able to:

• see a listed view of all my flashcards
• have the listed view be presented as a truncated preview of the question and answer of each card
• have an "add flashcard" functionality that connects to the make_flashcard page.

Future work to build on top of this:

• area to edit and delete flashcards
• have the option to "study flashcards" which will present the cards in a study view