style(post): enhance post separator and adjust tag display for improved layout

templates/page.html

@@ -10,7 +10,13 @@
         <span class="post-date" th:text="${#dates.format(singlePage.spec.publishTime,'yyyy-MM-dd')}">
           publishTime
         </span>
-        <span class="post-author" th:text="${':: '+singlePage.owner.displayName}">:: Author</span>
+        <span class="post-separator">
+          <span></span>
+          <span></span>
+          <span></span>
+          <span></span>
+        </span>
+        <span class="post-author" th:text="${singlePage.owner.displayName}">Author</span>
       </div>
       <div class="post-content">
         <div th:utext="${singlePage.content.content}">Post Content</div>