Standalone setup instructions assumes still using steam.

[XDelta]

The Standalone Setup Instructions assume a player wants to use steam to launch still. We should include or reference Neos Standalone Build Docs for modloader setup without steam. This should start after step 5, as a If you'd like to still use steam use these instructions or if you'd like to keep it standalone (or quest without steam) use these instead.

This ties in with documentation improvements mentioned here neos-modding-group/neos-mod-manifest#135