Make 404 page configurable

404.html

@@ -11,12 +11,16 @@ permalink: /404.html
       <div class="container">
         <div class="row">
           <div class="not-found">
-            <div class="not-found-bg"></div>
+						{% if site.meow_404 %}
+							<div class="not-found-bg"></div>
+						{% endif %}
             <div class="not-found-hint">
               <div class="not-found-code">
               404 NOT FOUND
               </div>
-              <span class="thuhidden">呜喵，金枪鱼</span>被吃掉了
+							{% if site.meow_404 %}
+								<span class="thuhidden">呜喵，金枪鱼</span>被吃掉了
+							{% endif %}
             </div>
             <div class="not-found-text thuhidden">
               如果您认为这一定是出了什么问题，或者正在寻找暂未包含的镜像，欢迎您前往 
@@ -43,14 +47,15 @@ permalink: /404.html
     {% include footer.html %}
     <script type="application/javascript">
       (function(){
+				var tag = "[" + "{{ site.issue_tag }}" + "]";
         var bugLink = document.getElementById("new_issue_bug");
         var bugURL = new URL(bugLink.href);
-        bugURL.searchParams.append("title", "404 at " + location.pathname);
+        bugURL.searchParams.append("title", tag + "404 at " + location.pathname);
         bugLink.href = bugURL.href;
         
         var mrLink = document.getElementById("new_issue_mr");
         var mrURL = new URL(mrLink.href);
-        mrURL.searchParams.append("title", "Mirror Request for new mirror " + 
+        mrURL.searchParams.append("title", tag + "Mirror Request for new mirror " + 
           location.pathname.split('/')[1]);
         mrLink.href = mrURL.href;
       })();

_config.yml

@@ -14,6 +14,8 @@ brand: Tsinghua Open Source Mirror
 operator: 清华大学信息化技术中心
 # operator: 北外信息技术中心
 logo: true
+meow_404: true
+issue_tag: tuna
 baseurl: "" # the subpath of your site, e.g. /blog
 permalink: "/:categories/:title/"
 url: "https://mirrors.tuna.tsinghua.edu.cn"