feat: 增加導覽欄顯示文章標題的選項 feat: 文章頁增加'返回首頁'文字 improvement: 當 per_page 為 0 時，頁面不顯示導覽列

source/css/_layout/head.styl

@@ -435,4 +435,29 @@
 
       &:hover
         &:after
-          width: 100%
+          width: 100%
+
+  .nav-page-title
+    position: relative
+    overflow: hidden
+
+    & > :first-child,
+    & > :last-child
+      display: inline-block
+      transition: all .3s ease-in-out
+
+    & > :last-child
+      position: absolute
+      top: 50%
+      left: 0
+      opacity: 0
+      transform: translateY(-50%) translateY(-10px)
+
+    &:hover
+      & > :last-child
+        opacity: 1
+        transform: translateY(-50%) translateY(0)
+
+      & > :first-child
+        opacity: 0
+        transform: translateY(10px)