Replace gdx setup references with Gdx-Liftoff#198

Raxorg merged 13 commits intolibgdx:devlibgdx/libgdx.github.io:devfrom

raeleus:Replace-gdx-setup-with-gdx-liftoffraeleus/libgdx.github.io:Replace-gdx-setup-with-gdx-liftoffCopy head branch name to clipboard