I have corrected broken links, including the first to the Xen project wiki and the one mentioned by Marek. I reviewed other links as well to be sure they are working
I have created another pull request to revise the introduction page. It replaces : #871, which will eventually need to be dropped.
This pull request is linked to issue [5357](
https://github.com/QubesOS/qubes-issues/issues/5357).
Besides some formatting changes (one line per sentence ; ### Title ###), I have slightly modified the text in the "why" section.
Thanks !