Update Minecraft wiki links to new domain

soups/show-and-tell/show-and-tell-16.snip.markdown

@@ -62,11 +62,11 @@ Thanks to everyone for coming. Hope to see you next time.
 [Minecraft]: https://en.wikipedia.org/wiki/Minecraft
 [minecraft-tracy-island]: http://www.planetminecraft.com/project/thunderbirds-tracy-island/
 [microsoft-buying-minecraft]: http://arstechnica.com/gaming/2014/09/report-microsoft-to-buy-minecraft-developer-mojang-for-2-billion/
-[minecraft-creative-mode]: http://minecraft.gamepedia.com/Creative
-[minecraft-logic-gates]: http://minecraft.gamepedia.com/Tutorials/Basic_logic_gates
-[minecraft-redstone]: http://minecraft.gamepedia.com/Redstone
+[minecraft-creative-mode]: http://minecraft.wiki/w/Creative
+[minecraft-logic-gates]: http://minecraft.wiki/w/Tutorials/Basic_logic_gates
+[minecraft-redstone]: http://minecraft.wiki/w/Redstone
 [london-computation-club]: http://london.computation.club
-[minecraft-piston]: http://minecraft.gamepedia.com/Piston
+[minecraft-piston]: http://minecraft.wiki/w/Piston
 [minecraft-pianola]: https://www.youtube.com/watch?v=qt1fOED0vC8
 [minecraft-music-sequencer]: https://www.youtube.com/watch?v=bWkgiTvMZKQ
 [nand2tetris-js]: https://github.com/floehopper/nand2tetris.js/tree/master

soups/show-and-tell/show-and-tell-20.snip.markdown

@@ -54,12 +54,12 @@ Until next time,
 [tower-defence]: https://en.wikipedia.org/wiki/Tower_defense
 [monument-valley]: http://www.monumentvalleygame.com/
 [ben-griffiths]: https://twitter.com/beng
-[minecraft-mods]: http://minecraft.gamepedia.com/Mods
-[minecraft-commands]: http://minecraft.gamepedia.com/Commands
-[minecraft-chat]: http://minecraft.gamepedia.com/Chat#Chat
-[minecraft-summon-command]: http://minecraft.gamepedia.com/Commands#summon
-[minecraft-command-block]: http://minecraft.gamepedia.com/Command_Block
-[minecraft-chicken]: http://minecraft.gamepedia.com/Chicken
+[minecraft-mods]: http://minecraft.wiki/w/Mods
+[minecraft-commands]: http://minecraft.wiki/w/Commands
+[minecraft-chat]: http://minecraft.wiki/w/Chat#Chat
+[minecraft-summon-command]: http://minecraft.wiki/w/Commands#summon
+[minecraft-command-block]: http://minecraft.wiki/w/Command_Block
+[minecraft-chicken]: http://minecraft.wiki/w/Chicken
 [macro]: https://en.wikipedia.org/wiki/Macro_(computer_science)
 [minecraft-one-command-generator]: https://mrgarretto.com/cmdcombiner
 [minecraft-one-command-video]: https://www.youtube.com/watch?v=BHumMbexjAs