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/components/budget-balances/component.js

@@ -1,10 +1,13 @@
 import Component from '@glimmer/component';
 import { inject as service } from '@ember/service';
-import { alias } from '@ember/object/computed';
 
 export default class BudgetBalancesComponent extends Component {
   @service communityFunds;
-  @alias('communityFunds.balances') balances;
+
+  get balancesSorted () {
+    return this.communityFunds.balances
+               .sortBy('confirmed_balance').reverse();
+  }
 
   get loading () {
     return !this.communityFunds.balancesLoaded;