Simplify _zen.scss by using componets classes.

layouts/partials/dates.html

@@ -1,4 +1,4 @@
-<p class="content-dates">
+<div class="content-dates meta">
 {{ i18n "last_mod" }} {{ .Lastmod.Format ($.Param "dateformat" | default "2 January, 2006") }}<br>
 {{ i18n "created" }} {{ .Date.Format ($.Param "dateformat" | default "2 January, 2006") }}
-</p>
+</div>

layouts/partials/submitted.html

@@ -1,3 +1,3 @@
-<div class="submitted">
+<div class="submitted meta">
 {{ partial "author-date" . }}
 </div>

layouts/partials/tags.html

@@ -1,6 +1,6 @@
-<div class="tags">
+<div class="tags meta">
 {{ i18n "taxo_tags" }}:
-<ul>
+<ul class="flex-inline flex-inline--inline">
 {{ range (.GetTerms "tags") -}}
 <li><a href="{{ .Permalink }}">{{ .LinkTitle }}</a></li>
 {{ end -}}