Learn / State as a Snapshot (#494)

* Initial commit, intro

* Add missing translation in sidebar.

* setting-state-triggers-renders

* rendering-takes-a-snapshot-in-time

* state-over-time

* Minor improvement

* recap

* implement-a-traffic-light*

* Minor fix

* Minor fixes

* Apply suggestions from code review

Co-authored-by: Jakub Drozdek <30927218+jakubdrozdek@users.noreply.github.com>

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Co-authored-by: Jakub Drozdek <30927218+jakubdrozdek@users.noreply.github.com>

Author: dawidsabat