Merge pull request #4571 from segmentio/mixpanel-legacy-slug-fix

Updating Mixpanel Legacy slug

Author: forstisabella

src/_data/catalog/slugs.yml

@@ -103,4 +103,6 @@
 - original: "wisepops"
   override: "actions-wisepops"
 - original: "gwen-actions"
-  override: "actions-gwen-cloud"
+  override: "actions-gwen-cloud"
+- original: "mixpanel"
+  override: "mixpanel-legacy"