add npm i source-map-loader troubleshooting step
add npm i source-map-loader troubleshooting step

vector-im/riot-web,KentShikama/vector-web,martindale/vector,vector-im/vector-web,vector-im/vector-web,KentShikama/vector-web,martindale/vector,vector-im/vector-web,vector-im/vector-web,KentShikama/vector-web,vector-im/vector-web,vector-im/riot-web,pvagner/vector-web,KentShikama/vector-web,vector-im/riot-web,KentShikama/vector-web,vector-im/riot-web,vector-im/riot-web,pvagner/vector-web,vector-im/riot-web,KentShikama/vector-web