Add Tow-Boot warning to Downloads page

Arnaud Ferrarisrequested to merge
wip/undef/tow-boot-warning into master

This adds a header warning the user that they need to install Tow-Boot and linking to their getting started page. It also brings a bunch of the page CSS from the Mobian landing page. I'm still not happy with the text color, but the rest is working well.

Currently looks like
2022-07-03-145434_1499x498_scrot

Edited by Arnaud Ferraris

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