docs(catalog): include hydration-entrypoints/components in build

PiperOrigin-RevId: 538700579

Author: Elliott Marquez

catalog/esbuild.config.mjs

@@ -20,8 +20,8 @@ const jsFolder = DEV ? 'lib' : 'build';
 // you want to add SSR'd files here so that you can hydrate them later with
 // <lit-island import="js/components/element-definition.js"></lit-island>
 const tsEntrypoints = [
-  // entrypoints for hydrating SSR'd components
-  './src/hydration-entrypoints/*.ts',
+  // entrypoints for hydrating lit-islands
+  './src/hydration-entrypoints/**/*.ts',
   // also include a bundle for each individual page
   './src/pages/*.ts',
   // SSR stuff