move distro FDE+/boot/ guides to distro wikis/manuals and don't host them on libreboot.org anymore

The Guix, Fedora, Parabola and Trisquel guides were outdated and therefore deleted. The Debian guide should also be deleted, even though it's up to date. The hyperbola one is actually a link to a guide on the Hyperbola site.

These are guides for fully encrypted GNU+Linux systems, including /boot, but it's desirable for these to be documented instead by each distro, because then they will more likely be properly maintained.

We constantly have to update them, on libreboot.org. It is unsustainable. Move them to other projects and let them deal with it. Libreboot's only job is to boot you into a payload. The rest is up to you!

This concerns GRUB payload on x86 targets. For SeaBIOS, it's fairly easy to just push a button and the distro installer boots, or the installed distro just boots up as normal.

Here are links to the guides that were deleted:

The Trisquel one will be almost identical to the Debian one, with perhaps a few extra considerations taken. It's recommended to focus on Debian first, and then adapt that to Trisquel. However, Trisquel is based on Ubuntu, so the guide can also be adapted for the Ubuntu site. This will cover most Ubuntu and Debian based distros.

The remaining Debian guide is here: https://notabug.org/libreboot/lbwww/src/8844c201ef0d1ab856fed2aa5148b89100fffe0d/site/docs/gnulinux/encrypted_debian.md

The above is also present on the /tasks/ page of libreboot.org

#4 move distro FDE+/boot/ guides to distro wikis/manuals and don't host them on libreboot.org anymore