remove reference to gem theme in config
remove reference to gem theme in config

PredictiveEcology/PredictiveEcology.org,timboe/timboe.github.io,PredictiveEcology/PredictiveEcology.org,dinglixiang/dinglixiang.github.io,rcanzanese/personal-website,rcanzanese/personal-website,timboe/timboe.github.io,rohanchandra/type-theme,rohanchandra/type-theme,timboe/timboe.github.io,dinglixiang/dinglixiang.github.io,dinglixiang/dinglixiang.github.io,rohanchandra/type-theme,PredictiveEcology/PredictiveEcology.org