website: update backtrace explanations

Simon Frei freisim93 at
Mon Oct 16 15:10:52 BST 2017

I added information about how to get a backtrace when using an appimage.
To do so I reordered the explanations a bit. Please have a look whether
it is comprehensible. Also a more extensive explanation of what you
actually need to do on windows would be useful, but I have no idea about

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