feat: 適配hexo 5.1.0 prismjs caption

feat: code-font-size 也會影響行內代碼塊字體大小 #325
fix: 修復aside recent post的 time 在safari沒有顯示的bug
fix: 修復 prismjs 在 tags-toggle 外掛標簽裏，代碼塊顯示一行的bugs
style: 刪除不必要的css

source/css/_highlight/highlight/index.styl

@@ -26,20 +26,6 @@ if $highlight_theme != false
       padding: 0
       border: none
 
-    figcaption
-      clearfix()
-      padding: .3rem 0 .1rem .7rem
-      font-size: 1em
-      line-height: 1em
-
-      a
-        float: right
-        padding-right: 10px
-        color: $highlight-foreground
-
-        &:hover
-          border-bottom-color: $highlight-foreground
-
     .gutter pre
       padding-right: .5rem
       padding-left: .5rem
@@ -51,4 +37,3 @@ if $highlight_theme != false
       padding-right: .5rem
       padding-left: .5rem
       width: 100%
-