add tunnel to side nav (#2741)

Author: philhawksworth

deploy/_data.ts

@@ -38,6 +38,10 @@ export const sidebar = [
         title: "Timelines",
         href: "/deploy/reference/timelines/",
       },
+      {
+        title: "Tunnel",
+        href: "/deploy/reference/tunnel/",
+      },
       {
         title: "Observability",
         href: "/deploy/reference/observability/",