Use new balance APIs from akkounts

* Use sats integer values instead of floats
* Add lightning Network account balance
* Use icons and titles/descriptions to discern between balance types
* Use more flexible config for balances (to add e.g. RBTC or BTC ecash
  later)

app/styles/components/_budget-balances.scss

@@ -16,8 +16,12 @@ section#funds {
     }
 
     th, td {
-      font-size: 1.2rem;
       vertical-align: text-bottom;
+
+      img {
+        max-height: 1.5rem;
+        max-width: 1.5rem;
+      }
     }
 
     th {
@@ -35,8 +39,13 @@ section#funds {
       }
 
       &.fiat-amount {
+        font-size: 1.2rem;
         color: rgba(255,255,255,0.8);
       }
+
+      span.unit {
+        font-size: 1.5rem;
+      }
     }
   }
 }