Add the ability to favorite or bookmark a page

PMLeema

Adding the functionality to put a bookmark on a page one uses often would be very helpful.  Favoriting cards is useful, but if there are other cards on that page you need to be able to access quickly, you have you favorite all of them, instead of just favoriting or bookmarking a page.  Additionally, if you favorite a card, you can't tell which page it was on, so you HAVE to favorite all the cards you need on the page.