!str #16455 Remove unused fanout settings
!str #16557 Rename Source.singleton to Source.single
=str #16479 Make constructor of FreeDirective internal
+doc quickstart docs for akka streams, initial version
Merge pull request #16526 from ktoso/docs-streams-quickstart-ktoso

akka-streams docs - quickstart
Merge pull request #16558 from akka/wip-16479-FreeDirective-patriknw

=str #16479 Make constructor of FreeDirective internal
Merge pull request #16556 from akka/wip-16455-cleanup-materializer-settings-patriknw

!str #16455 Remove unused fanout settings
Merge pull request #16559 from akka/wip-16557-Source.single-patriknw

!str #16557 Rename Source.singleton to Source.single
+doc akka streams docs, flowGraphs
Merge pull request #16555 from ktoso/docs-streams-graphs

akka streams docs: graphs
!str #16484 #16392 Remove String identifier of junctions

* descriptive name can still be defined with OperationAttributes.name
* revisit all factory methods (apply/create) and implement and document
  them in a consistent manner