Remove swift support with Nvidia killing it?

[cooperlees]

https://github.com/pypa/bandersnatch/runs/5011251999?check_suite_focus=true

• Need to workout new link

Also want to workout if swift is actually being use and if we want to keep the code around.

• It seems Nvidia has killed it after purchase?

cc: @techalchemy is it still worth keeping?

[cooperlees]

https://github.com/pypa/bandersnatch/commit/082ac7b9f185993d17e8779f804c70ee190ba28a - Fixes docs for now.

I will remove swift support if no one speaks in a month or so.

[cooperlees]

FWIW - I see the docker image still being pulled. So I will leave swift support until it causes pain. Then we can ask this question again.