chore(css): remove unused background image reference

wuliupo · user378230 · commit 49fe6075ea2d · 2016-05-31T12:51:34.000+01:00
`background-image: url(header.png);` in css not required or provided. Closes #1627
diff --git a/docs/assets/docs.css b/docs/assets/docs.css
@@ -164,7 +164,6 @@ section {
   text-shadow: 0 1px 0 rgba(0,0,0,.15);
   color: #cdbfe3;
   background-color: #563d7c;
-  background-image: url(header.png);
 }
 
   .bs-header a {

Original file line number	Diff line number	Diff line change
`@@ -164,7 +164,6 @@ section {`
`164`	`164`	`text-shadow: 0 1px 0 rgba(0,0,0,.15);`
`165`	`165`	`color: #cdbfe3;`
`166`	`166`	`background-color: #563d7c;`
`167`		`- background-image: url(header.png);`
`168`	`167`	`}`
`169`	`168`
`170`	`169`	`.bs-header a {`