Add description to other layouts

- helps adding description to sub-sections,
  search, terms, archive pages

layouts/_default/search.html

@@ -8,6 +8,11 @@
             <line x1="21" y1="21" x2="16.65" y2="16.65"></line>
         </svg>
     </h1>
+    {{- if .Description }}
+    <div class="post-description">
+        {{ .Description }}
+    </div>
+    {{- end }}
     {{- if not (.Param "hideMeta") }}
     <div class="post-meta">
         {{- if .IsTranslated -}}