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Better document disk space requirements to build Tails

Closes #17781

See merge request !50

Closes #17788

Closes #17787

Add workaround for AMD Radeon R5 to graphics known issues page (closes: #17789)

Closes #17789

See merge request !57

As @boyska pointed out, when building on disk the additional
qcow file in `/var/lib/libvirt/images` can grow quite a bit:
up to 12 GB according to `vagrant/lib/tails_build_settings.rb`.

refs: #17781

In `vagrant/lib/tails_build_settings.rb` we set `VM_MEMORY_BASE`
to 1.5 GiB.

refs: #17781

refs: #17781

Closes #17793

This reverts commit 51aa3b8b.

This is not needed anymore.