fix(ci): avoid serializing downloaded sitemap endpoints

Keep the Pagefind bootstrap path from rewriting the remote sitemap
payload locally when the static JSON file is absent. GitHub-hosted runs
only need the fetched data in memory, and stringifying the 385 MB payload
was exhausting Node during netlify-build.

scripts/build-pagefind-index.js

@@ -22,7 +22,6 @@ async function loadSitemapEndpoints () {
     apiUrl.pathname = sitemapEndpointsPath.replace(/^\.?\/?static\//, '/')
 
     const response = await axios.get( apiUrl.toString() )
-    await fs.outputJson( sitemapEndpointsPath, response.data, { spaces: 2 } )
 
     return response.data
 }