Mark scala-lagom-server as deprecated #1055

Job	Run time
Build sbt/Scala client, servers (samples/client/petstore/scalaz)	1m 0s
Build sbt/Scala client, servers (samples/client/petstore/java/okhttp-gson)	54s
Build sbt/Scala client, servers (samples/client/petstore/scala-pekko)	53s
Build sbt/Scala client, servers (samples/client/petstore/scala-http4s)	52s
Build sbt/Scala client, servers (samples/client/petstore/scala-sttp4-jsoniter)	55s
Build sbt/Scala client, servers (samples/server/petstore/scala-pekko-http-server)	54s
Build sbt/Scala client, servers (samples/server/petstore/scala-play-server)	5m 14s
Build sbt/Scala client, servers (samples/server/petstore/scala-http4s-server)	1m 0s
Build sbt/Scala client, servers (samples/server/petstore/scala-cask)	1m 25s
Build sbt/Scala client, servers (samples/server/petstore/scalatra)	3m 24s
Build sbt/Scala client, servers (samples/server/petstore/scala-akka-http-server)	56s
	17m 27s

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