Add redirect option

_includes/head.html

@@ -1,6 +1,9 @@
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
+{%- if page.redirect -%}
+  {% include head/redirect.html delay=page.redirect.delay destination=page.redirect.destination  %}
+{%- endif -%}
 
 {%- include snippets/get-article-title.html article=page -%}
 <title>{%- if __return -%}{{ __return }} - {{ site.title }}{%- else -%}{{ site.title }}{%- endif -%}</title>

_includes/head/redirect.html

@@ -0,0 +1 @@
+<meta http-equiv="refresh" content="{{ include.delay }};url={{ include.destination }}">

docs/_docs/en/2.3-layouts.md

@@ -58,6 +58,7 @@ Base on Base Layout.
 | **sidebar**       | `!!map`               | | |
 | **footer**        | false                 | Set as `false` to hide footer on this page. | 2.2.3 |
 | **lightbox**      | true, false           | Set as `true` to enable lightbox (modal image gallery) for large images on this page, you can set `lightbox-ignore` class name to ignore the certain image. | 2.2.4 |
+| **redirect**      | `!!map`               | Redirection destination and delay. |
 
 ### header
 
@@ -103,6 +104,13 @@ Base on Base Layout.
 | ---               | ---                   | ---         |
 | **nav**           | `!!str`               | |
 
+### redirect
+
+| Variable          | Option Values         | Description
+| ---               | ---                   | ---         |
+| **destination**   | `!!str`               | Redirection destination URL.  |
+| **delay**         | `!!int`               | Delay in seconds before being redirected |
+
 ## Article Layout
 
 Base on Page Layout.