[Feature Request]: Update Arch Install Instructions

[mrbass21]

Is your feature request related to a problem? Please describe.

The wiki page for how to install AzerothCore on Arch are not correct. The AUR package points to an ancient version. Since AzerothCore no longer really does major releases, there's not really a point to the AUR repo for it.

Describe the solution you'd like

I think the Arch wiki page should be updated to walk the user through a normal install.

The steps would be:

1. Update docs/arch_install.md to reflect the current method for install
   1. The trick here is we need to use the AUR to install mysql. This also involves importing the mysql signing key into the keyring.
2. Update 'docs/es/arch_install.md` with translated instructions. If the author of the changes is not fluent in es, use Google Translate to get a "best effort" translation.

Describe alternatives you've considered

We could just delete the Arch install page, but given that it's so different from Debain based installs, I think it's worth updating the instructions so different distributions at least have an idea on how to install it on flavors similar to Arch.

The issue author uses Arch, btw.

Additional context

I'm more than happy to take this ticket for myself as I have the steps in a document from a recent install on Arch, but if there's anyone else out there that wants to tackle this before I get to it, feel free to!

[TheSCREWEDSoftware]

Windows, Mac and Linux (Ubuntu) are official supported and mainanted, the rest made by the community is up to anyone to do it.