Ditch Franklin in favor of DocumenterVitepress?

[avik-pal]

We are somewhat far from having multi-docs support for Documenter vitepress, but it still allows us to create nicer landing pages (https://lux.csail.mit.edu/stable/ (I am biased here :P))

[ChrisRackauckas]

I'd support it. Definitely looks better.

[AJ0070]

DocumenterVitepress looks much better. I would love to help in this.