Remove Autostart parameter and make the flow to be always enabled (#3423)

* removed Autostart parameter and make it enabled by default

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* show menu entry in UI

* cleanup migration

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param-docs/parameter-pages/AutoTimer/AutoStart.md

@@ -2,11 +2,4 @@
 Default Value: `true`
 
 !!! Warning
-    This is an **Expert Parameter**! Only change it if you understand what it does!
-
-Automatically start the Flow (Digitization Rounds) immediately after power up.
-
-!!! Note
-    Typically this is set to `true`.
-    The main reasons to set it to `false` is when you want to trigger it manually using the
-    [REST API](../REST-API) or [MQTT-API](../MQTT-API) or for debugging.
+This parameter is no longer available. The flow is now always enabled. If you want it to be disabled, set an interval which is high enough (eg. 1440 = 24h).

param-docs/parameter-pages/AutoTimer/Interval.md

@@ -4,4 +4,8 @@ Default Value: `5`
 Unit: Minutes
 
 Interval in which the Flow (Digitization Round) is run.
+It will run immediately on startup and then the next time after the given interval.
 If a round takes longer than this interval, the next round gets postponed until the current round completes.
+
+!!! Note
+If you want the flow to be disabled, set an interval which is high enough (eg. 1440 = 24h).