Reorganize docs into user/admin guide
Refresh the user and admin guide for v3 changes, and reorganize into
a narrative structure which makes more sense for v3.
Change-Id: I4ac3b18d5ed33b0fea4e2ef0318b19bfc3447ccc
diff --git a/doc/source/admin/drivers/timer.rst b/doc/source/admin/drivers/timer.rst
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+:title: Timer Driver
+
+Timer
+=====
+
+The timer driver supports triggers only. It is used for configuring
+pipelines so that jobs run at scheduled times. No connection
+configuration is required.
+
+Trgger Configuration
+--------------------
+
+Timers don't require a special connection or driver. Instead they can
+simply be used by listing **timer** as the trigger.
+
+This trigger will run based on a cron-style time specification.
+It will enqueue an event into its pipeline for every project
+defined in the configuration. Any job associated with the
+pipeline will run in response to that event.
+
+**time**
+The time specification in cron syntax. Only the 5 part syntax is
+supported, not the symbolic names. Example: ``0 0 * * *`` runs
+at midnight.