style(posts): remove background from post header and border from post article

Author: srerickson

static/css/ucsb.css

@@ -21,4 +21,13 @@ header {
 
 header nav a {
   background-color: var(--accent-bg);
+}
+
+header.post-header {
+  background-image: none;
+}
+
+article.post {
+  border: none;
+  padding: 0;
 }