Use Freenet SVG logo as favicon instead of plain "F" letter

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sanity

hugo-site/themes/freenet/layouts/partials/head.html

@@ -7,7 +7,7 @@
 {{ with .OutputFormats.Get "RSS" }}
   {{ printf `<link rel=%q type=%q href=%q title=%q>` .Rel .MediaType.Type .Permalink $.Site.Title | safeHTML }}
 {{ end }}
-<link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>F</text></svg>">
+<link rel="icon" type="image/svg+xml" href="/freenet_logo.svg">
 {{ partialCached "head/css.html" . }}
 {{ partialCached "head/js.html" . }}
 {{ partial "api-url.html" . }}