Removes extra space from the body and footer to prevent scrolling on a page that fits into the viewport (#3792)

Signed-off-by: Liam Cottam <killtheidols@hotmail.co.uk>

public/less/_base.less

@@ -54,7 +54,7 @@ pre, code {
 }
 .full.height {
     padding: 0;
-    margin: 0 0 -@footer-margin*2 0;
+    margin: 0 0 -@footer-margin 0;
     min-height: 100%;
 }
 .following.bar {
@@ -399,7 +399,6 @@ pre, code {
 }
 
 footer {
-    margin-top: @footer-margin+14px !important;
     height: @footer-margin;
     background-color: white;
     border-top: 1px solid #d6d6d6;