Move stats styles to the stats stylesheet

These styles aren't only used in the admin section but also in the
public stats page.

app/assets/stylesheets/admin.scss

@@ -5,7 +5,6 @@
 // 01. Global styles
 // 02. Sidebar
 // 03. List elements
-// 04. Stats
 // 05. Management
 // 06. Polls
 // 07. Legislation
@@ -364,30 +363,6 @@ code {
   }
 }
 
-// 04. Stats
-// ---------
-
-.stats-numbers {
-  p {
-    color: $text-medium;
-    font-size: rem-calc(13);
-    padding: rem-calc(6);
-    text-transform: uppercase;
-
-    &.featured {
-      background: $info-bg;
-      border: 1px solid $info-border;
-      font-weight: bold;
-    }
-
-    .number {
-      color: $body-font-color;
-      font-size: rem-calc(30);
-      font-weight: bold;
-    }
-  }
-}
-
 // 05. Management
 // --------------
 

app/assets/stylesheets/stats.scss

@@ -173,6 +173,27 @@
   }
 }
 
+.stats-numbers {
+  p {
+    color: $text-medium;
+    font-size: rem-calc(13);
+    padding: rem-calc(6);
+    text-transform: uppercase;
+
+    &.featured {
+      background: $info-bg;
+      border: 1px solid $info-border;
+      font-weight: bold;
+    }
+
+    .number {
+      color: $body-font-color;
+      font-size: rem-calc(30);
+      font-weight: bold;
+    }
+  }
+}
+
 table {
 
   &.survey-districts {