Feature: Implement iCal integration for calendar, improve styling (#2376)

* Feature: Implement iCal integration, improve calendar/agenda styling

* Delete calendar.jsx

* Calendar proxy handler

* code style

* Add some basic error handling

---------

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/widgets/calendar/widget.js

@@ -0,0 +1,8 @@
+import calendarProxyHandler from "./proxy";
+
+const widget = {
+  api: "{url}",
+  proxyHandler: calendarProxyHandler,
+};
+
+export default widget;