UI: Make navbar full width (#5998)

public/less/_base.less

@@ -98,6 +98,12 @@ pre > code {
         width: 16px;
         text-align: center;
     }
+    #navbar {
+        width: 100vw;
+    }
+    #navbar .brand {
+        margin: 0 0 0 .5rem;
+    }
     @media only screen and (max-width: 767px) {
         #navbar:not(.shown) > *:not(:first-child) {
             display: none;