refactor templates layout

@see https://gohugo.io/templates/new-templatesystem-overview/

layouts/_partials/single/main-body/links/link/title-link.html

@@ -0,0 +1,32 @@
+{{- /*
+  Displays an internal link with a title
+
+  @params pc  Page context
+  @params sc  Site context
+  @params link Link URL
+  */
+-}}
+
+
+<!-- Validation -->
+
+{{- if ( not ( isset . "sc" ) ) -}}
+  {{- errorf "No site context received" -}}
+{{- end -}}
+
+{{- if ( not ( isset . "pc" ) ) -}}
+  {{- errorf "No page context received (%q)" .sc.Page.File.Dir -}}
+{{- end -}}
+
+{{- if ( or ( not ( isset . "title" ) ) ( eq .title "" ) ) -}}
+  {{- warnf "No title found (%q)" $.sc.Page.File.Path -}}
+{{- end -}}
+
+{{- if not ( hasPrefix .link "http" ) -}}
+  {{- warnf "Link '%q' is not a URL, did you mean to use 'src'? (%q)" .link $.sc.Page.File.Path -}}
+{{- end -}}
+
+
+<!-- Rendering -->
+
+<li><a href="{{ .link }}">{{ .title | $.sc.RenderString | safeHTML }}</a></li>