images not resolving in static events

[bridgetkromhout]

I noticed that https://www.devopsdays.org/events/2016-minneapolis/speakers/ had broken images. I looked into it, and it appears that we don't have images loading correctly in archived events that have been built for the live site. If I check locally, it still doesn't work because www.devopsdays.org is baked into the static files. If I look directly at the URL of a speaker image locally (not a link to it), it does still exist and redirect to where it lives in /static: http://localhost:1313/events/2016-minneapolis/speakers/aj-bowen.jpg

Spot checks make it look like this problem is happening in more events than one, and with front-page images, etc.

I looked at the /static/_redirects file but it doesn't appear relevant in this case. I'm not positive what's happening that's causing this, and haven't put more time into looking for why, but it does appear that this is a regression. Noting it here so I don't forget.