Remove version badge

The version badge sometimes hides content, especially on mobile.  Since
c17deff, we display a user-friendly
version number in the top left corner of the screen at all times.  As
such, there isn't a need to also display the same information in the top
right corner of the screen.

lib/rdoc/generator/template/rails/_panel.rhtml

@@ -1,7 +1,4 @@
 <a href="#" class="back-to-top"></a>
-<% if project_version %>
-  <div id="version-badge"><%= project_version %></div>
-<% end %>
 
 <nav id="panel" class="panel">
   <div class="banner">

lib/rdoc/generator/template/rails/resources/css/main.css

@@ -177,24 +177,6 @@ th
   font-size: 2rem;
 }
 
-#version-badge {
-  position: fixed;
-  right: 0;
-  top: 0;
-  z-index: 100;
-  color: white;
-  transform: rotate(45deg) translate(27.5%, -40%);
-  min-width: 200px;
-  font-size: 30px;
-  font-weight: bold;
-  font-style: italic;
-  line-height: 1.5;
-  text-shadow: 2px 2px 4px #5400007d;
-  text-align: center;
-  box-shadow: 0px 2px 2px 1px #1209096e;
-  background: radial-gradient(circle, rgb(255, 10, 0) 0%, rgb(200, 0, 0) 90%);
-}
-
 a.back-to-top {
   visibility: hidden;
   position: fixed;