docs: drop section in getting started on sharing settings
docs: drop section in getting started on sharing settings

with vals allowed in .sbt files, it is not necessary to include it

mdedetrich/sbt,twitter-forks/sbt,dyx/sbt,jaceklaskowski/sbt,adriaanm/sbt,jkinkead/sbt,sbt/sbt,corespring/sbt,jaceklaskowski/sbt,pocketberserker/sbt,sbt/sbt,twitter-forks/sbt,mdedetrich/sbt,dyx/sbt,Duhemm/sbt,xuwei-k/xsbt,dyx/sbt,twitter-forks/sbt,jaceklaskowski/sbt,jkinkead/sbt,dyx/sbt,xuwei-k/xsbt,xeno-by/old-scalameta-sbt,Sciss/sbt,xeno-by/old-scalameta-sbt,twitter-forks/sbt,xeno-by/old-scalameta-sbt,xuwei-k/xsbt,sbt/sbt,jkinkead/sbt,jasonchaffee/sbt,twitter-forks/sbt,sbt/sbt,mdedetrich/sbt,xeno-by/old-scalameta-sbt,jaceklaskowski/sbt,dyx/sbt,mdedetrich/sbt,jkinkead/sbt,Duhemm/compiler-bridge,xuwei-k/xsbt,xuwei-k/xsbt,mdedetrich/sbt,dansanduleac/sbt,xeno-by/old-scalameta-sbt,xeno-by/old-scalameta-sbt,som-snytt/xsbt,jaceklaskowski/sbt,sbt/sbt,sbt/sbt,pdalpra/sbt,mdedetrich/sbt,jkinkead/sbt,Duhemm/sbt,sbt/sbt,mdedetrich/sbt