Maybe we can (or need to) postpone this for now. I have been taking a look at https://wiki.kerbalspaceprogram.com/wiki/Kerbal_Space_Program_Wiki:Migration_problems and I found out that some problems still persist. The first one I saw is SVG thumbnail creation through https://wiki.kerbalspaceprogram.com/wiki/File:Ambox_warning_orange.svg. From the displayed error:
Error creating thumbnail: /bin/bash: rsvg-convert: command not found
I presume that it is an internal config problem. The fixes I could think of are
Check if "rsvg-convert" is installed on the host, if not, do it.
If "rsvg-convert" is installed but not on directory pointed by software, maybe change (or add) some config keys to LocalSettings.php: "$wgSVGConverter" "$wgSVGConverters" "$wgSVGConverterPath" (not all are required, but I don't know the host's configs so I'm throwing all of it here.)
Please also see: https://www.mediawiki.org/wiki/Manual:Image_administration#Image_thumbnailing