drop mixed-mapgen image from slideshow for now

It may confuses visitors since we're not writing about one single world anymore

app/views/home/index.html.erb

@@ -62,15 +62,15 @@
         <hr style="margin-top:20px;"/>
         <div id="diashow" class="carousel slide carousel-fade" data-ride="carousel">
             <ol class="carousel-indicators">
+<!--                <li data-target="#diashow" data-slide-to="0" class="active"></li> -->
                 <li data-target="#diashow" data-slide-to="0" class="active"></li>
                 <li data-target="#diashow" data-slide-to="1"></li>
-                <li data-target="#diashow" data-slide-to="2"></li>
             </ol>
             <div class="carousel-inner">
-                <div class="item active">
+              <!--  <div class="item active">
                     <img src="//images.illuna-minetest.tk/diashow/1.jpg" alt="...">
-                </div>
-                <div class="item">
+              </div> -->
+                <div class="item active">
                     <img src="//images.illuna-minetest.tk/diashow/2.jpg" alt="...">
                 </div>
                 <div class="item">