Add a calendar for open community calls.

We're going to try using Jitsi since it seemed to
offer the best combination of features:
* no time limit
* ability to record meetings + publish on youtube.

The `.ics` file is hand-crafted, but validated
using https://icalendar.org/validator.html and also
checked in Google calendar.

Using the `webcal:` pseudo-protocol for the link on
the page should mean the browser passes the URL to
the calendar app to be subscribed-to there.
That should cause the calendar app to regularly
poll for updates, in case we decide to cancel/reschedule
meetings. I thought that was preferable to the user
downloading a `.ics` and importing and then us making
changes to the schedule making the imported event
series stale.

Putting these two together means we should have the liberty
to cancel (using `EXDATE:`) and reschedule events if we
need to. Note that I've already excluded
New Years Eve 2026  using `EXDATE:`.

Signed-off-by: Tom Bentley <tbentley@redhat.com>

Author: tombentley

join-us/community-call.ics

@@ -0,0 +1,41 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Kroxylicious Community Call//Event Feed 1.0//EN
+CALSCALE:GREGORIAN
+METHOD:PUBLISH
+X-WR-CALNAME:Kroxylicious Community Call
+X-WR-TIMEZONE:UTC
+BEGIN:VEVENT
+UID:morning-series@kroxylicious.io
+DTSTAMP:20260326T100000Z
+DTSTART:20260326T080000Z
+DTEND:20260326T084500Z
+RRULE:FREQ=WEEKLY;INTERVAL=4;BYDAY=TH
+EXDATE:20261231T080000Z
+SUMMARY:Kroxylicious Community Call
+DESCRIPTION:This is the UK morning slot of our bi-weekly rotation.\n
+ Click to join: 
+ https://meet.jit.si/moderated/87697d32deaa8cbd8b3b96e1
+ bbb8aef920c240112935c2d4742c3b1b38a34588 \n
+URL:https://meet.jit.si/moderated/87697d32deaa8cbd8b3b96e1
+ bbb8aef920c240112935c2d4742c3b1b38a34588
+LOCATION:https://meet.jit.si/moderated/87697d32deaa8cbd8b3b96e1
+ bbb8aef920c240112935c2d4742c3b1b38a34588
+END:VEVENT
+BEGIN:VEVENT
+UID:evening-series@kroxylicious.io
+DTSTAMP:20260311T100000Z
+DTSTART:20260311T200000Z
+DTEND:20260311T204500Z
+RRULE:FREQ=WEEKLY;INTERVAL=4;BYDAY=WE
+SUMMARY:Kroxylicious Community Call
+DESCRIPTION:This is the UK evening slot of our bi-weekly rotation.\n
+ Click to join: 
+ https://meet.jit.si/moderated/87697d32deaa8cbd8b3b96e1
+ bbb8aef920c240112935c2d4742c3b1b38a34588 \n
+URL:https://meet.jit.si/moderated/87697d32deaa8cbd8b3b96e1
+ bbb8aef920c240112935c2d4742c3b1b38a34588
+LOCATION:https://meet.jit.si/moderated/87697d32deaa8cbd8b3b96e1
+ bbb8aef920c240112935c2d4742c3b1b38a34588
+END:VEVENT
+END:VCALENDAR

join-us/index.md

@@ -54,11 +54,16 @@ title: Join Us!
         </div>
         <div class="col">
           <div class="card shadow mb-2 mx-2 h-100">
-            <div class="card-header"><h2 class="card-title fs-4">Join our monthly Office Hours</h2></div>
+            <div class="card-header"><h2 class="card-title fs-4">Join our fortnightly Office Hours</h2></div>
             <div class="card-body mx-3 my-2">
               <p>Sometimes it's just easier to talk face-to-face. 
-              We have a meeting every month that's open to anyone to come along.</p>
-              <p>The date and time is advertised on the <a href="https://kroxylicious.slack.com/archives/C050RNMQW8G">#general</a> Slack channel.</p>
+              We have a meeting every two weeks that's open to anyone to come along.
+              The time alternates to accomodate people from different parts of the world, 
+              so check the next-but-one if the next meeting is in the middle of your night.
+              </p>
+            </div>
+            <div class="card-footer text-center">
+               <a href="webcal://kroxylicious.io/join-us/community-call.ics" class="btn btn-primary">Subscribe in my calendar</a>
             </div>
           </div>
         </div>
@@ -147,4 +152,4 @@ title: Join Us!
       </div>
     </div>
   </div>
-</div>
+</div>