Add missing index for /latest/aviate-database-migrations.html

Author: sbrossie

html5/_main_toc.html.slim

@@ -312,6 +312,9 @@ nav.sidebar-nav
         li
           a.nav-link href="/latest/how-to-install-the-aviate-plugin.html"
             | Plugin Installation
+        li
+          a.nav-link href="/latest/aviate-database-migrations.html"
+            | Database Migrations
         li
           a.nav-link href="/latest/aviate-health.html"
             | Health