Preload the fonts the design actually uses

The document still preloaded the Archivo file the old design used, which is now
gone: a 404 on every page load. It preloads Playfair Display and Plus Jakarta
Sans instead, and the asset test names a font that exists.

src/render/layout.ts

@@ -34,7 +34,14 @@ export function renderDocument(input: DocumentInput): Html {
     <link rel="icon" href="${logo}" />
     <link
       rel="preload"
-      href="/assets/fonts/archivo-latin.woff2"
+      href="/assets/fonts/playfair-display-latin.woff2"
+      as="font"
+      type="font/woff2"
+      crossorigin
+    />
+    <link
+      rel="preload"
+      href="/assets/fonts/plus-jakarta-sans-latin.woff2"
       as="font"
       type="font/woff2"
       crossorigin