add redirect for embedded shell

Author: jeff-allen-mongo

config/redirects

@@ -10,3 +10,5 @@ raw: compass/ -> ${base}/current
 raw: compass/manual/aggregation-pipeline-builder -> ${base}/current/aggregation-pipeline-builder
 
 [master-beta]: compass/${version}/query-bar -> ${base}/${version}/query/filter/
+
+master: compass/${version}/embedded-shell -> ${base}/${version}/