Use protocol-relative image url in welcome.json
Use protocol-relative image url in welcome.json

anxintiancai/TimelineJS,pom95/timeline,1modm/TimelineJS,LauraHilliger/TimelineJS,pom95/timeline,NUKnightLab/TimelineJS,LauraHilliger/TimelineJS,1modm/TimelineJS,djaney/TimelineJS,pom95/timeline,deenjohn/TimelineJS,ycaihua/TimelineJS,NUKnightLab/TimelineJS,djaney/TimelineJS,zstao/TimelineJS,anxintiancai/TimelineJS,landsurveyorsunited/TimelineJS,landsurveyorsunited/TimelineJS,JoaquinSiabra/TimelineJS,JoaquinSiabra/TimelineJS,zstao/TimelineJS,JoaquinSiabra/TimelineJS,noikiy/TimelineJS,1modm/TimelineJS,ryekee/TimelineJS,djaney/TimelineJS,ycaihua/TimelineJS,LauraHilliger/TimelineJS,stea4lth/TimelineJS,deenjohn/TimelineJS,deenjohn/TimelineJS,noikiy/TimelineJS,ryekee/TimelineJS,james-logan/TimelineJS,james-logan/TimelineJS,NUKnightLab/TimelineJS,stea4lth/TimelineJS,james-logan/TimelineJS,stea4lth/TimelineJS,noikiy/TimelineJS,landsurveyorsunited/TimelineJS,zstao/TimelineJS,ryekee/TimelineJS,ycaihua/TimelineJS,anxintiancai/TimelineJS