Document Lighthouse blob schema (#125)

* add a link to official documentation

Author: max-ostapenko

src/content/docs/reference/blobs/lighthouse.mdx

@@ -8,8 +8,4 @@ _As: [`lighthouse`](/reference/tables/pages/#lighthouse)_
 
 JSON-encoded blob of Lighthouse data for the page.
 
-**The actual schema of the Lighthouse object is liable to change depending on the page and Lighthouse version.**
-
-## Schema
-
-TODO
+**The actual schema of the Lighthouse object is liable to change depending on the page and Lighthouse version. See the [Lighthouse documentation](https://github.com/GoogleChrome/lighthouse/blob/main/docs/understanding-results.md) for the most up-to-date information.**