feat: publisher, local business and home crumb settings

- Publisher and Local business tabs with the C20 refusals (sameAs lines,
  person as local business, address, times, country, coordinates)
- the publisher node from the settings, as an Organization, a Person or
  the chosen local business type with address, geo and opening hours
- P8 publisher preview with Google's required and recommended findings
  (classes/schema Validate)
- the home crumb name on the General tab; every new key in the settings
  API and seo_update_settings

controllers/settings/_publisher_preview.htm

@@ -0,0 +1,14 @@
+{{- if .Data.JSON -}}
+<div class="summer-markdown">
+<pre>{{ .Data.JSON }}</pre>
+</div>
+{{- end -}}
+{{- range .Data.Findings -}}
+<div class="summer-callout summer-callout--warning" role="status">
+<p class="summer-callout__text">{{ . }}</p>
+</div>
+{{- else -}}
+<div class="summer-callout" role="status">
+<p class="summer-callout__text">{{ .Data.AllGood }}</p>
+</div>
+{{- end -}}