Basic CalDav UI (Calendar)

This implements a basic CalDav UI, titled "Calendar". It allows creating new calendars and events with a start and end date, URL, location, and description.

You can also import and export ICS (VCALENDAR + VEVENT) files.

It allows editing the ICS directly, for power users.

Additionally, you can hide/display events from certain calendars, change their names and their colors. If there's no calendar created yet in your CalDav server (first-time setup), it'll automatically create one, titled "Calendar".

You can also change the display timezone for the calendar from the settings.

Finally, there's some minor documentation fixes and some other minor tweaks.

Closes #56
Closes #89

routes/calendars.tsx

@@ -0,0 +1,36 @@
+import { Handlers, PageProps } from 'fresh/server.ts';
+
+import { FreshContextState } from '/lib/types.ts';
+import { Calendar, CalendarModel } from '/lib/models/calendar.ts';
+import Calendars from '/islands/calendar/Calendars.tsx';
+import { AppConfig } from '/lib/config.ts';
+
+interface Data {
+  userCalendars: Calendar[];
+}
+
+export const handler: Handlers<Data, FreshContextState> = {
+  async GET(request, context) {
+    if (!context.state.user) {
+      return new Response('Redirect', { status: 303, headers: { 'Location': `/login` } });
+    }
+
+    const calendarConfig = await AppConfig.getCalendarConfig();
+
+    if (!calendarConfig.enableCalDavServer) {
+      throw new Error('CalDAV server is not enabled');
+    }
+
+    const userCalendars = await CalendarModel.list(context.state.user.id);
+
+    return await context.render({ userCalendars });
+  },
+};
+
+export default function CalendarsPage({ data }: PageProps<Data, FreshContextState>) {
+  return (
+    <main>
+      <Calendars initialCalendars={data.userCalendars || []} />
+    </main>
+  );
+}