DOC: Add link to dev calendar and meeting notes (#29737)

Author: TomAugspurger

doc/source/development/index.rst

@@ -19,3 +19,4 @@ Development
     developer
     policies
     roadmap
+    meeting

doc/source/development/meeting.rst

@@ -0,0 +1,32 @@
+.. _meeting:
+
+==================
+Developer Meetings
+==================
+
+We hold regular developer meetings on the second Wednesday
+of each month at 18:00 UTC. These meetings and their minutes are open to
+the public. All are welcome to join.
+
+Minutes
+-------
+
+The minutes of past meetings are available in `this Google Document <https://docs.google.com/document/d/1tGbTiYORHiSPgVMXawiweGJlBw5dOkVJLY-licoBmBU/edit?usp=sharing>`__.
+
+Calendar
+--------
+
+This calendar shows all the developer meetings.
+
+.. raw:: html
+
+   <iframe src="https://calendar.google.com/calendar/embed?src=pgbn14p6poja8a1cf2dv2jhrmg%40group.calendar.google.com" style="border: 0" width="800" height="600" frameborder="0" scrolling="no"></iframe>
+
+You can subscribe to this calendar with the following links:
+
+* `iCal <https://calendar.google.com/calendar/ical/pgbn14p6poja8a1cf2dv2jhrmg%40group.calendar.google.com/public/basic.ics>`__
+* `Google calendar <https://calendar.google.com/calendar/embed?src=pgbn14p6poja8a1cf2dv2jhrmg%40group.calendar.google.com>`__
+
+Additionally, we'll sometimes have one-off meetings on specific topics.
+These will be published on the same calendar.
+