Change archive-card shortcut to backtick for better ergonomics

client/lib/keyboard.js

@@ -190,7 +190,7 @@ Mousetrap.bind('space', evt => {
   }
 });
 
-Mousetrap.bind('-', evt => {
+Mousetrap.bind('`', evt => {
   const cardId = getSelectedCardId();
   if (!cardId) {
     return;
@@ -285,7 +285,7 @@ Template.keyboardShortcuts.helpers({
       action: 'shortcut-assign-self',
     },
     {
-      keys: ['-'],
+      keys: ['`'],
       action: 'archive-card',
     },
     {