Add locally testable version with changes to both controller files

Client-side changes:
1) temporarily replaced azure with localhost for easy testing;
2) commented out the option to fetch cards from local storage, because this results in bugs. Local storage and database sometimes unsync. As a consequence, data cannot be saved in the join table.

Backend changes:
1) Changed db helper functions (restored the original version without dataValues).
2) Made corresponding changes to the controllers.js file.
3) Increased the number of items to be fetched from Yummly.
4) Make call to Yummly API on initialization only.
5) Cleaned up comments.

Everything works together well locally.
WIll deploy with next pull request.