I'm not sure how to test this, before we push it. We might need a few iterations to get it right.

I want to revamp the website structure a bit, which will sadly break links but I think it's necessary. I'll repeat in bold: this will break existing links to our website.

The current structure is:

/     <- a super simple page with links
/user <- coreutils mdbook
/dev  <- coreutils rustdoc

This leaves no room for findutils, which should probably not be left behind :). This PR creates the following structure:

/                <- page about uutils with links to coreutils and findutils

/coreutils       <- oranda website for coreutils
/coreutils/book  <- coreutils mdbook (generated by oranda at this location)
/coreutils/dev   <- coreutils rustdoc

/findutils       <- oranda website for findutils
/findutils/book  <- findutils mdbook (does not exist yet)
/findutils/dev   <- findutils rustdoc

Although, to be honest, I don't even think we need the rustdoc, given that docs.rs exists. But I've kept it for now.

This PR just creates that structure. As a follow up I'll try to write a nice homepage.