Remove usused css for about page

Also removes some whitespace on sections and headings that can be
better left as default.

app/assets/stylesheets/common.scss

@@ -2650,53 +2650,12 @@ input.richtext_title[type="text"] {
   background-size: cover;
   background-attachment: fixed;
 
-  .caption {
-    max-width: 200px;
-    font: 13px/20px Helvetica, Arial, sans-serif;
-    position: fixed;
-    text-align: right;
-    right: 20px;
-    bottom: 60px;
-    text-shadow: #000 0px 1px 5px;
-    color: $lightgrey;
-    opacity: 0.8;
-    display: none;
-  }
-
-  .caption a {
-    color: white;
-    white-space: nowrap;
-    text-decoration: none;
-  }
-
-  a.next {
-    display: block;
-    position: fixed;
-    right: 10px;
-    bottom: 10px;
-    width: 40px;
-    height: 40px;
-    border-radius: 5px;
-    text-indent: -9999px;
-    overflow: hidden;
-    background: image-url('about/sprite.png') -120px 0px no-repeat;
-    background-color: #000;
-    background-color: rgba(0, 0, 0, 0.5);
-  }
 
   .content-inner {
     position: relative;
     color: #333;
     min-width: 320px;
     max-width: 640px;
-
-    .section {
-      margin-bottom: 30px;
-    }
-
-    .section:last-child {
-      margin-bottom: 0;
-    }
   }
 
   .text {
@@ -2756,10 +2715,6 @@ input.richtext_title[type="text"] {
     }
   }
 
-  h2 {
-    margin-bottom: 10px;
-  }
-
   .icon {
     width: 30px;
     height: 30px;