Add docs for OpenTelemetry in Deno (#1305)

Co-authored-by: Jo Franchetti <jofranchetti@gmail.com>

Author: lucacasonato

runtime/_data.ts

@@ -36,6 +36,10 @@ export const sidebar = [
         label: "HTTP Server",
         id: "/runtime/fundamentals/http_server/",
       },
+      {
+        label: "Open Telemetry",
+        id: "/runtime/fundamentals/open_telemetry/",
+      },
       "/runtime/fundamentals/stability_and_releases/",
     ],
   },