perf: Preload the bold body font

Lighthouse showed noto-sans-700 arriving late through the css chain on
pages that use bold text above the fold.

Author: lfrancke

ui/src/partials/head-styles.hbs

@@ -1,3 +1,4 @@
     <link rel="preload" href="{{{uiRootPath}}}/font/noto-sans-latin-400-normal.woff2" as="font" type="font/woff2" crossorigin>
     <link rel="preload" href="{{{uiRootPath}}}/font/ibm-plex-mono-latin-600-normal.woff2" as="font" type="font/woff2" crossorigin>
+    <link rel="preload" href="{{{uiRootPath}}}/font/noto-sans-latin-700-normal.woff2" as="font" type="font/woff2" crossorigin>
     <link rel="stylesheet" href="{{{uiRootPath}}}/css/site.css">