Align step-image with the left of #content

And adjust the margin on it's right accordingly...

wiki/src/install/inc/stylesheets/steps.css

 #content {
-  padding-left: 250px;
+  padding-left: 225px;
 }
 
 /* Headings */
@@ -53,7 +53,7 @@ pre, p.pre {
 
 .step-image {
   position: absolute;
-  left: 2.5em;
+  left: 2em;
   width: 200px;
 }