Fix spacing of nav header

Former-commit-id: 3468dc38

app/assets/stylesheets/framework/header.scss

@@ -155,7 +155,7 @@ header {
     .header-logo {
       display: inline-block;
-      margin: 0 7px 0 2px;
+      margin: 0 12px 0 2px;
       position: relative;
       top: 10px;
       transition-duration: .3s;
@@ -186,7 +186,7 @@ header {
       display: flex;
       align-items: flex-start;
       flex: 1 1 auto;
-      padding-top: (($header-height - 19) / 2);
+      padding-top: 14px;
       overflow: hidden;
     }