Update Aemulus instructions to use the simpler installer

[alexankitty]

On the Persona 3 FES Modding section there is a substantially easier installer I put together that I would recommend using instead with fully working one click support.

The relevant info on the readthedocs is here https://persona-3-fes-modding-guide.readthedocs.io/en/latest/linuxaemulussetup.html

The actual installer is here https://github.com/alexankitty/aemulus-installer-linux

At last check I think steam deck might require wine-staging to get a recent enough version of wine to run aemulus with full support, but I'm not 100% certain on that.