Refactor redirects into service-specific file

Author: Esther Fan

.openpublishing.publish.config.json

@@ -987,6 +987,7 @@
   "articles/iot-fundamentals/.openpublishing.redirection.iot-fundamentals.json",
   "articles/iot-hub/.openpublishing.redirection.iot-hub.json",
   "articles/load-testing/.openpublishing.redirection.azure-load-testing.json",
+  "articles/logic-apps/.openpublishing.redirection.logic-apps.json",
   "articles/machine-learning/.openpublishing.redirection.machine-learning.json",
   "articles/mariadb/.openpublishing.redirection.mariadb.json",
   "articles/marketplace/.openpublishing.redirection.marketplace.json",