A more generic tag/value component

Write styles and templates for a more generic tag/value component. Use this component
for the taxonomy lists, draft tag, and page dates in the summary template.

layouts/partials/page/date.html

@@ -0,0 +1,25 @@
+{{/*
+
+  Outputs a date tag for a page.
+
+  @context {Page} .page  The current page
+  @context {String} .date  The date, one of "published", or "updated".
+  @context {String} .class  Additional classes to apply to the rendered content.
+
+*/}}
+
+{{- $page := .page -}}
+{{- $dateName := .date -}}
+
+{{- $name := "" -}}
+{{- $date := $page.Date -}}
+
+{{- if or (not $dateName) (eq $dateName "date") }}
+  {{- $name = T "datePublishedName" -}}
+{{- else -}}
+{{ end -}}
+
+<div class="{{ with .class }}{{ . }}  {{ end }}tag">
+  <span class="tag__name">{{ $name }}</span>
+  <span class="tag__value">{{ $date | time.Format "2006-01-02" }}</span>
+</div>