Use paige.site_title, site.Title as home title fallbacks

layouts/partials/paige/breadcrumbs.html

@@ -4,8 +4,18 @@
     <nav aria-label="{{ i18n `paige_breadcrumbs` }}" class="mt-3" id="paige-breadcrumbs">
         <div class="d-flex justify-content-center">
             <ol class="breadcrumb mb-0">
-                {{ range .Reverse }}
-                    <li class="breadcrumb-item"><a href="{{ .RelPermalink }}">{{ .Title | markdownify | plainify | htmlUnescape }}</a></li>
+                {{ $reverse := .Reverse }}
+
+                {{ $last := sub (len $reverse) 1 }}
+
+                {{ range $i, $ancestor := $reverse }}
+                    {{ $title := $ancestor.Title }}
+
+                    {{ if and (eq $i $last) (not $title) }}
+                        {{ $title = $page.Param "paige.site_title" | default (site.Title) }}
+                    {{ end }}
+
+                    <li class="breadcrumb-item"><a href="{{ .RelPermalink }}">{{ $title | markdownify | plainify | htmlUnescape }}</a></li>
                 {{ end }}
             </ol>
         </div>