feat: add Roux external link to footer nav

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

hugo.toml

@@ -57,6 +57,10 @@ weight = 1
 name = "Imprint"
 url = "/imprint/"
 weight = 2
+[[menus.footer]]
+name = "Roux"
+url = "https://roux.pivoine.art"
+weight = 3
 
 [markup.goldmark.renderer]
 unsafe = true

layouts/partials/footer.html

@@ -23,7 +23,18 @@
       <ul class="flex flex-wrap gap-x-8 gap-y-4">
         {{- range .Site.Menus.footer -}}
           <li>
-            <a href="{{ .URL }}" class="label text-fog hover:text-heat transition-colors">{{ .Name }}</a>
+            {{- if hasPrefix .URL "http" -}}
+              <a
+                href="{{ .URL }}"
+                target="_blank"
+                rel="noopener noreferrer"
+                class="label text-fog hover:text-heat transition-colors"
+              >
+                {{- .Name -}}{{ partial "icon.html" "arrow-external" }}
+              </a>
+            {{- else -}}
+              <a href="{{ .URL }}" class="label text-fog hover:text-heat transition-colors">{{ .Name }}</a>
+            {{- end -}}
           </li>
         {{- end -}}
         {{- with .Site.Params.social -}}