Kibana homepage logo is not accessible

[bhavyarm]

Kibana version: 6.1.2 BC1

Elasticsearch version: 6.1.2 BC1

Server OS version: darwin_x86_64

Browser version: chrome latest

Browser OS version: OS X

Original install method (e.g. download page, yum, from source, etc.): from staging

Description of the problem including expected versus actual behavior:

1. aXe audit on Kibana home page shows a severe warning on Kibana logo.
2. User cannot tab from Kibana logo into contents of homepage.

Warning:

<li> elements must be contained in a <ul> or <ol>
 Impact: serious
 Element location
a > li.logo.kibana
Element source
<li ng-if="!logoBrand &amp;&amp; !smallLogoBrand" aria-label="Kibana Logo" class="logo kibana"></li>

https://dequeuniversity.com/rules/axe/2.6/listitem?application=AxeChrome

cc @timroes