docs(homepage): Update homepage for v6

[edonehoo]

Closes #13

May be finished post-launch?

[edonehoo]

Basic/early attempt here. Mostly opening this pr for a visual reference to iterate on - copy is still in progres. Would love to do this kind of thing:

But I can't get the code for split cards to work. Although, this would rely on the time to create images. There may be Red Hat resources that we can PF-brand?

Footer could use some updates, whether that's in this pr or a followup

[patternfly-build]

Preview: https://patternfly-org-pr-4155-site.surge.sh

[edonehoo]

this isn't needed--working with Bekah to put together design mockups for this in Figma, which will need to be implemented eventually by a dev in a new pr