remove kubeval link (#1126)

kubeval project is no longer supported; the link now goes to a sketchy site 

longer-term, this whole page should probably be reevaluated

Author: tarynlucas

functions/ts/kubeval/README.md

@@ -2,7 +2,7 @@
 
 ## Overview
 
-The `kubeval` function wraps the [`kubeval`] binary to validate resources
+The `kubeval` function wraps the `kubeval` binary to validate resources
 against their [json schemas].
 
 This function is often used in the following scenarios:
@@ -66,6 +66,4 @@ Config Connector resources).
 If you want to convert OpenAPI to json schema, you can use
 [openapi2jsonschema](https://github.com/instrumenta/openapi2jsonschema).
 
-[`kubeval`]:https://kubeval.com
-
 [json schemas]:https://json-schema.org