removing videos from docs

docs/lessons/truth-or-dare/activity.md

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 Welcome! This tutorial will teach how to program a game of truth or dare on the micro:bit. Let's get started!
 

docs/lessons/truth-or-dare/tutorial.md

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 The *Truth or dare!* game works as follows: a player spins the BBC micro:bit on the table. 
 When the micro:bit stops spinning, the player pointed by the arrow (displayed on screen) must press the button "A"