Extension support page (#1112)

Signed-off-by: Roman <ixrock@gmail.com>
Co-authored-by: Jim Ehrismann <40840436+jim-docker@users.noreply.github.com>

extensions/example-extension/renderer.tsx

@@ -10,7 +10,7 @@ export default class ExampleExtension extends LensRendererExtension {
   registerPages(registry: Registry.PageRegistry) {
     this.disposers.push(
       registry.add({
-        type: Registry.DynamicPageType.CLUSTER,
+        type: Registry.PageRegistryType.CLUSTER,
         path: "/extension-example",
         title: "Example Extension",
         components: {