feat: add option to set rel attribute in bundle and extra menu (#968)

exampleSite/data/menu/main.yaml

@@ -8,6 +8,7 @@ main:
           en: Level 1.1 (EN)
           de: Level 1.1 (DE)
         ref: "/toc-tree/level-1/level-1-1"
+        rel: me
       - name: Level 1.2
         ref: "/toc-tree/level-1/level-1-2"
       - name: Level 1.3

layouts/partials/menu-bundle.html

@@ -60,6 +60,9 @@
                   class="gdoc-nav__entry{{- if not .external }}
                     {{- if $isCurrent }}{{ printf " is-active" }}{{ end }}
                   {{- end }}"
+                  {{ if .rel -}}
+                    rel="{{ .rel }}"
+                  {{- end }}
                 >
                   {{ $name }}
                 </a>

layouts/partials/menu-extra.html

@@ -33,6 +33,9 @@
               {{ relref $current .ref }}
             {{- end }}"
             class="gdoc-header__link"
+            {{ if .rel -}}
+              rel="{{ .rel }}"
+            {{- end }}
           >
             <svg class="gdoc-icon {{ .icon }}">
               <title>{{ $name }}</title>