cfg: make SPA optional

layouts/partials/backlinks.html

@@ -10,6 +10,7 @@
     {{$cleanedInbound := apply (apply $inbound "index" "." "source") "replace" "." " " "-"}}
     {{- range $cleanedInbound | uniq -}}
       {{$l := printf "%s%s/" $host .}}
+      {{$l = cond (eq $l "//") "/" $l}}
       {{with (index $contentTable .)}}
       <li>
           <a href="{{$l}}">{{index (index . "title")}}</a>