VASP main page updates

[tayloraubry]

Ported VASP friendly users documentation to main page and cut down text overall

[mcfarljm]

I think the reorganization and simplification is a great improvement.

My main comments are:

1. Would it be best to remove the VASP sections that currently exist under Swift (https://nrel.github.io/HPC/Documentation/Systems/Swift/running/#running-vasp) and Vermilion (https://nrel.github.io/HPC/Documentation/Systems/Vermilion/running/#running-vasp-on-vermilion), and perhaps replace those with a link to this section, since you have provided examples for all systems here? At a minimum, that reduces duplication and would make it easier to maintain the example scripts moving forward.
2. I had problems running the example scripts for Vermilion, per my comments. I know that's not the focus of this PR, so I wouldn't want to delay getting these changes incorporated just because of the issues with the vermilion examples. If there aren't quick fixes for the vermilion examples, we should probably create a GH Issue to keep track of getting them updated.

[yandthj]

Thanks for the review @mcfarljm . I have a PR in (#501) to remove the VASP sections under Swift and Vermilion pages as you mentioned in your comment.
@tayloraubry If there aren't quick fixes for the vermilion example problems that John pointed out, could you create issues for them or let me know?

[tayloraubry]

@mcfarljm Thanks for the review, I accepted all your suggestions and made several issues surrounding VASP on Vermillion scripts.
@yandthj Let me know if I need to do anything else. (Not sure if I am supposed to close this)

[yandthj]

Just noted a few spelling errors.

I think it's an improvement to have removed the multiple links/explanations of the benchmark studies repo, but do you think there should be one link to it on this page? I'm not sure if that info is helpful to some users.