Introduce own Numeric type and revert to stdlib from pgx

web/accounts.html

@@ -11,7 +11,7 @@
     {{range .Accounts}}
     <div class="budget-item">
         <a href="account/{{.ID}}">{{.Name}}</a>
-        <span class="time">{{.Balance}}</span>
+        <span class="time">{{printf "%.2f" .GetBalance}}</span>
     </div>
     {{end}}
 {{end}}