Consider switching to Rufus instead of UUI for Windows users

Originally created by @emmapeel on #11825 (Redmine)

We receive many reports of users that have problems after installing Tails
with UUI.

Rufus is free software and does not seem to have problems to create our
filesystem correctly.

Maybe we could change the install procedure to recommend Rufus?

Edited May 15, 2020 by emmapeel

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