add redirect to the SendGrid docs

Author: rchinn1

src/connections/destinations/catalog/actions-sendgrid/index.md

@@ -4,6 +4,7 @@ hide-boilerplate: true
 hide-dossier: true
 redirect_from:
   - "/connections/destinations/catalog/sendgrid-marketing-campaigns/"
+  - "/connections/destinations/catalog/sendgrid/"
 id: 631a6f32946dd8197e9cab66
 ---