refactor(baseof): partial should not be a full page template

layouts/partials/widget_page.html

@@ -1,5 +1,3 @@
-{{- define "main" -}}
-
 {{/* Notify JS that this is a widget page */}}
 <span class="js-widget-page d-none"></span>
 
@@ -74,5 +72,3 @@
     {{if $use_container}}</div>{{end}}
   </section>
 {{ end }}
-
-{{- end -}}