Rain Recurrence Time is a 'hidden' feature

Problem
=======
Rain recurrence time is an advanced feature with statistics not all of our users understand. Besides rain recurrence times become relevant for extreme rainfall events. Not all rainfall events.

Solution
======
- [ ] Hide rain recurrence card when not active
- [ ] add a button of somesort to the rain/card or rain layer. whatevs

:money_with_wings: