Change link to mermaid plugin
Change link to mermaid plugin

Repository name for mermaid plugin has changed to better reflect naming conventions
iflyup/gitbook,athiruban/gitbook,guiquanz/gitbook,grokcoder/gitbook,haamop/documentation,ZachLamb/gitbook,a-moses/gitbook,tzq668766/gitbook,justinleoye/gitbook,iflyup/gitbook,webwlsong/gitbook,shibe97/gitbook,snowsnail/gitbook,nycitt/gitbook,xxxhycl2010/gitbook,minghe/gitbook,justinleoye/gitbook,ZachLamb/gitbook,palerdot/gitbook,bradparks/gitbook,2390183798/gitbook,sunlianghua/gitbook,grokcoder/gitbook,intfrr/gitbook,GitbookIO/gitbook,npracht/documentation,thelastmile/gitbook,guiquanz/gitbook,ferrior30/gitbook,mautic/documentation,tshoper/gitbook,gencer/gitbook,snowsnail/gitbook,tzq668766/gitbook,boyXiong/gitbook,athiruban/gitbook,intfrr/gitbook,kamyu104/gitbook,thelastmile/gitbook,xiongjungit/gitbook,sunlianghua/gitbook,gdbooks/gitbook,palerdot/gitbook,CN-Sean/gitbook,switchspan/gitbook,OriPekelman/gitbook,alex-dixon/gitbook,wewelove/gitbook,hujianfei1989/gitbook,minghe/gitbook,iamchenxin/gitbook,JohnTroony/gitbook,xxxhycl2010/gitbook,kamyu104/gitbook,gaearon/gitbook,lucciano/gitbook,boyXiong/gitbook,haamop/documentation,shibe97/gitbook,Keystion/gitbook,vehar/gitbook,mautic/documentation,lucciano/gitbook,OriPekelman/gitbook,xiongjungit/gitbook,a-moses/gitbook,jasonslyvia/gitbook,iamchenxin/gitbook,wewelove/gitbook,yaonphy/SwiftBlog,2390183798/gitbook,sudobashme/gitbook,bradparks/gitbook,jocr1627/gitbook,youprofit/gitbook,jasonslyvia/gitbook,rohan07/gitbook,switchspan/gitbook,ferrior30/gitbook,JohnTroony/gitbook,megumiteam/documentation,npracht/documentation,nycitt/gitbook,xcv58/gitbook,megumiteam/documentation,qingying5810/gitbook,sudobashme/gitbook,youprofit/gitbook,rohan07/gitbook,mruse/gitbook,mruse/gitbook,xcv58/gitbook,gdbooks/gitbook,hongbinz/gitbook,qingying5810/gitbook,tshoper/gitbook,FKV587/gitbook,codepiano/gitbook,CN-Sean/gitbook,jocr1627/gitbook,strawluffy/gitbook,FKV587/gitbook,alex-dixon/gitbook,hujianfei1989/gitbook,hongbinz/gitbook,vehar/gitbook,escopecz/documentation,gaearon/gitbook,gencer/gitbook,escopecz/documentation,webwlsong/gitbook,ryanswanson/gitbook,codepiano/gitbook