Move site closure notice to head of the page

Author: takezoe

_sass/_base.scss

@@ -213,4 +213,5 @@ pre {
 
 .warning {
     font-weight: bold;
+    margin-bottom: 20px;
 }

index.html

@@ -4,14 +4,14 @@
 
 <div class="home">
 
-  <h1 class="page-heading">This is the community site for all the public <a href="https://github.com/gitbucket/gitbucket">GitBucket</a> plugins.</h1>
-
   <div class="warning">
     Note: This site is no longer maintained and will soon be deleted completely.
     The list of community plugins is now managed on a Wiki page in the gitbucket repository: 
     <a href="https://github.com/gitbucket/gitbucket/wiki/Community-Plugins">https://github.com/gitbucket/gitbucket/wiki/Community-Plugins</a>
   </div>
 
+  <h1 class="page-heading">This is the community site for all the public <a href="https://github.com/gitbucket/gitbucket">GitBucket</a> plugins.</h1>
+
   <h1 class="page-heading">Available Plugins:</h1>
   <p class="separator"/>
   <ul class="plugin-list">