chore: import upstream snapshot with attribution

views/install/error.html

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+<br>
+<div class="container">
+    <div class="row row-offcanvas row-offcanvas-right">
+        <div class="col-xs-6 col-sm-3 sidebar-offcanvas">
+            <div class="panel-body">{{$server := .server}}{{$envData := .envData}}
+                <div class="row">
+                    <div class="panel panel-default">
+                        <div class="panel-heading"><strong>安装步骤</strong></div>
+                        <div class="list-group">
+                            <a href="#" class="list-group-item"><i class="glyphicon glyphicon-hand-right"></i> 1. 许可协议</a>
+                            <a href="#" class="list-group-item active"><i class="glyphicon glyphicon-hand-right"></i> 2. 环境检测</a>
+                            <a href="#" class="list-group-item"><i class="glyphicon glyphicon-hand-right"></i> 3. 系统配置</a>
+                            <a href="#" class="list-group-item"><i class="glyphicon glyphicon-hand-right"></i> 4. 数据库配置</a>
+                            <a href="#" class="list-group-item"><i class="glyphicon glyphicon-hand-right"></i> 5. 准备安装</a>
+                            <a href="#" class="list-group-item"><i class="glyphicon glyphicon-hand-right"></i> 6. 安装完成</a>
+                        </div>
+                        <div class="panel-footer">
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+        <div class="col-xs-12 col-sm-9">
+            <div class="panel-body">
+
+            </div>
+        </div>
+    </div>
+    <hr>
+    <footer>
+        <p>© {{.copyright}}</p>
+    </footer>
+</div>