Fix images in welcome email.
Fix images in welcome email.

tbolon/platform,42wim/platform,daizenberg/platform,rahulltkr/platform,mozilla/mattermoz,fosstp/platform,tbolon/platform,ZBoxApp/platform,npcode/platform,ZBoxApp/platform,trashcan/platform,HackerHappyHour/platform,StateFarmIns/mattermost,lawrenae/mattermost,ninja-/platform,npcode/platform,ttyniwa/platform,xogeny/platform,lawrenae/mattermost,mozilla/mattermoz,npcode/platform,rgarmsen2295/platform,rompic/platform,bkeroack/platform,daizenberg/platform,raghavenc5/TabGen,raghavenc5/TabGen,ZBoxApp/platform,42wim/platform,rahulltkr/platform,rahulltkr/platform,trashcan/platform,raghavenc5/TabGen,cyanlime/platform,cadecairos/mattermoz,rgarmsen2295/platform,TSlean/platform,cadecairos/mattermoz,andela/mattermost-platform,dotcominternet/platform,tbolon/platform,npcode/platform,raghavenc5/TabGen,ninja-/platform,tbalthazar/platform,raghavenc5/TabGen,ninja-/platform,TSlean/platform,andela/mattermost-platform,rgarmsen2295/platform,florianorben/platform,mozilla/mattermoz,apaatsio/platform,bkeroack/platform,dimitertodorov/platform,dimitertodorov/platform,npcode/platform,asaadmahmoodspin/platform,ZBoxApp/platform,ZBoxApp/platform,trashcan/platform,cyanlime/platform,andela/mattermost-platform,xogeny/platform,rgarmsen2295/platform,HackerHappyHour/platform,tbolon/platform,HackerHappyHour/platform,andela/mattermost-platform,fosstp/platform,fosstp/platform,cadecairos/mattermoz,xogeny/platform,cyanlime/platform,apaatsio/platform,cadecairos/mattermoz,florianorben/platform,TSlean/platform,lawrenae/mattermost,numericube/platform,mozilla/mattermoz,xogeny/platform,StateFarmIns/mattermost,dotcominternet/platform,lawrenae/mattermost,kernicPanel/platform,apaatsio/platform,HackerHappyHour/platform,trashcan/platform,ttyniwa/platform,numericube/platform,rompic/platform,bkeroack/platform,lawrenae/mattermost,dotcominternet/platform,mozilla/mattermoz,StateFarmIns/mattermost,florianorben/platform,samogot/platform,rahulltkr/platform,StateFarmIns/mattermost,trashcan/platform,cadecairos/mattermoz,kernicPanel/platform,daizenberg/platform,florianorben/platform,tbalthazar/platform,tbalthazar/platform,kernicPanel/platform,rgarmsen2295/platform,bkeroack/platform,TSlean/platform,kernicPanel/platform,ninja-/platform,tbolon/platform,asaadmahmoodspin/platform,dotcominternet/platform,dimitertodorov/platform,42wim/platform,florianorben/platform,xogeny/platform,apaatsio/platform,samogot/platform,fosstp/platform,HackerHappyHour/platform,numericube/platform,andela/mattermost-platform,ninja-/platform,asaadmahmoodspin/platform,ttyniwa/platform,cyanlime/platform,bkeroack/platform,ttyniwa/platform,TSlean/platform,ttyniwa/platform,rompic/platform,StateFarmIns/mattermost,apaatsio/platform,kernicPanel/platform,samogot/platform