Improve landing page

[EmilHvitfeldt]

Runing lighthouse on the landing page isn't great right now. there are a couple of obvious things we can do

[hfrick]

I think we could also take a second look at the content. I agree with what's there but think maybe some small tweaks could make it easier to grasp quickly what tidymodels is and why it's worth your time.

For example, it currently doesn't mention that it's in R and does not say more than "tidyverse principles". The second paragraph says that it's a consistent, flexible framework but does not tie this back to the tidyverse principles. I think we'd need something that motivates a bit more clearly why/when it's worth making your way through the 5 Get Started articles - because 5 articles might be - or even just might seem - like a lot of work to get started.