Add logs explorer note to logs settings page (#4646)

(cherry picked from commit 3b19778)

docs/en/observability/configure-logs-sources.asciidoc

@@ -1,6 +1,14 @@
 [[configure-data-sources]]
 = Configure data sources
 
+.There's a new, better way to explore your logs!
+[sidebar]
+--
+These settings only apply to the Logs Stream app. The Logs Stream app and dashboard panel are deactivated by default. We recommend viewing and inspecting your logs with <<explore-logs, Logs Explorer>> as it provides more features, better performance, and more intuitive navigation.
+
+To activate the Logs Stream app, refer to <<activate-logs-stream>>.
+--
+
 Specify the source configuration for logs in the
 {kibana-ref}/logs-ui-settings-kb.html[Logs settings] in the
 {kibana-ref}/settings.html[{kib} configuration file].