Improvements to new community dashboard

- Limit dashboard to yearly,quarterly,monthly,weekly
- Always prefer UTC full days for reporting

app/assets/javascripts/admin/controllers/admin-dashboard-next.js.es6

@@ -5,12 +5,15 @@ import Report from "admin/models/report";
 
 export default Ember.Controller.extend({
   queryParams: ["period"],
-  period: "all",
+  period: "monthly",
   isLoading: false,
   dashboardFetchedAt: null,
   exceptionController: Ember.inject.controller("exception"),
   diskSpace: Ember.computed.alias("model.attributes.disk_space"),
 
+  availablePeriods: ["yearly", "quarterly", "monthly", "weekly"],
+
+
   fetchDashboard() {
     if (this.get("isLoading")) return;