Card images in Hand break for non-local paths#19

Card images that come from web urls do not display in Hands. ### Steps to Reproduce 1. Create a new Hand, Deck and a Card in that deck, all with the Monarch sheet type. 2. Set the back image of the card to a url that leads to an image file and save. 3. Add the card to the hand. **Expected:** The image will show normally in the hand. **Actual:** The card in hand is a blank box, opening the Card itself shows the image as normal. ### Cause In _templates/monarch-hand.hbs_ '/' is prepended to the url of the card image. Removing that breaks it for local file paths. `<div class="card" data-card-id="{{card.id}}" style="--card-image: url(/{{card.img}})">`