website: update backtrace explanations

Posted by Simon Frei on Oct 16, 2017; 2:10pm
URL: http://digikam.185.s1.nabble.com/website-update-backtrace-explanations-tp4704121.html

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
that.
diff:
https://commits.kde.org/websites/digikam-org/c5226a3868e5b36a6ddb3c677da5f16594027a52
staging: https://staging.digikam.org/contribute/