Merge submodule witchcraft into mods directory

.gitmodules

@@ -64,9 +64,6 @@
 [submodule "mods/playereffects"]
 	path = mods/playereffects
 	url = git://repo.or.cz/minetest_playereffects.git
-[submodule "mods/witchcraft"]
-	path = mods/witchcraft
-	url = https://github.com/D00Med/witchcraft.git
 [submodule "mods/morefarming"]
 	path = mods/morefarming
 	url = https://github.com/sys4-fr/morefarming.git