Do custom themes have to live outside of the wiki (eg. /usr/share/ikiwiki/themes/) or is there a way for them to live inside of the wiki srcdir?

I haven't been able to find a way so for now I'm just using a symlink, but that's a bit ugly.

I ask because I do most of my ikiwiki work on my laptop and then push changes to my server. It's not a big deal but it's annoying to have to sync the themes separately and it seems like something which should be able to live inside the wiki like templates.

Cheers,
AdamShand