Remove mineclone2 submodule, replace with a suggestion README

.gitmodules

@@ -40,9 +40,6 @@
 [submodule "bin/.bin"]
 	path = base/.bin
 	url = git@git.desu.ltd:salt/bin
-[submodule "desktop-common/.minetest/games/mineclone2"]
-	path = desktop-common/.minetest/games/mineclone2
-	url = https://git.minetest.land/Wuzzy/MineClone2
 [submodule "base/.vim/bundle/vim-terraform"]
 	path = base/.vim/bundle/vim-terraform
 	url = https://github.com/hashivim/vim-terraform

desktop-common/.minetest/games/README.md

@@ -0,0 +1 @@
+Consider MineClone2