Fix logo breaking on Heroku
Fix logo breaking on Heroku

reddotrubyconf/rdrc-cfp-app,reddotrubyconf/rdrc17-website,reddotrubyconf/rdrc17-website,reddotrubyconf/rdrc17-website,reddotrubyconf/rdrc-cfp-app,reddotrubyconf/rdrc-cfp-app