Add documentation on how to use ROCM on System76

[guilt]

For those with somewhat recent AMD graphics cards, they should be able to run ROCM via Docker easily.

I was asked to add this to the support docs, so I am going to start by adding this ticket here.

I have already added the basic steps/scripts in this gist but I am looking for more volunteers to test it. In the meantime, let me try to come up with better documentation that could be added to the portal. Even though I suck at it.

[jessecambon]

I am looking to test this and added a comment to the gist.

[jacobgkau]

We have instructions for installing ROCm now: https://support.system76.com/articles/rocm

This was added in #1231 in April of this year. I'm closing this issue as being resolved by that PR. Further contributions to the article are still welcome.