Add missing redirect

REDIRECTS

@@ -114,6 +114,7 @@ https://merginmaps.com/docs/concepts/synchronisation/	https://merginmaps.com/doc
 https://merginmaps.com/docs/concepts/synchronization/	https://merginmaps.com/docs/manage/synchronisation/
 https://merginmaps.com/docs/concepts/users-and-orgs/	https://merginmaps.com/docs/manage/workspaces/
 https://merginmaps.com/docs/dev/mergince/	https://merginmaps.com/docs/server/
+https://merginmaps.com/docs/dev/ce-migration/	https://merginmaps.com/docs/server/upgrade/
 https://merginmaps.com/docs/dev/merginmaps-ee/	https://merginmaps.com/docs/server/
 https://merginmaps.com/docs/fieldwork/gps_accuracy/	https://merginmaps.com/docs/field/gps_accuracy/
 https://merginmaps.com/docs/gis/enable_browsing/	https://merginmaps.com/docs/gis/search_data/