Generated by TRAVIS-CI c57878b

Navigation Menubar Example: delete 3 unused html files

Per comments in pull request #834, removed the following 3 html files that are no longer  used by the navigation menubar example.
deleted:    examples/menubar/menubar-1/mb-arts.html
deleted:    examples/menubar/menubar-1/mb-outreach.html
deleted:    examples/menubar/menubar-1/mb-research.html

index.html

@@ -521,9 +521,9 @@
   "preProcess": [
     null
   ],
-  "publishDate": "2018-08-16",
-  "publishISODate": "2018-08-16T00:00:00.000Z",
-  "generatedSubtitle": "Editor's Draft 16 August 2018"
+  "publishDate": "2018-08-17",
+  "publishISODate": "2018-08-17T00:00:00.000Z",
+  "generatedSubtitle": "Editor's Draft 17 August 2018"
 }</script><meta name="description" content="This document provides readers with an understanding of how to use WAI-ARIA 1.1 [WAI-ARIA] to create accessible rich internet applications.
       It describes considerations that might not be evident to most authors from the WAI-ARIA specification alone and recommends approaches to make widgets, navigation, and behaviors accessible using WAI-ARIA roles, states, and properties.
       This document is directed primarily to Web application developers, but the guidance is also useful for user agent and assistive technology developers."></head>
@@ -533,7 +533,7 @@
   </a>
   <h1 id="title" class="title p-name"><abbr title="Accessible Rich Internet Applications">WAI-ARIA</abbr> Authoring Practices 1.1</h1>
 
-  <h2 id="w3c-editor-s-draft-16-august-2018"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft <time class="dt-published" datetime="2018-08-16">16 August 2018</time></h2>
+  <h2 id="w3c-editor-s-draft-17-august-2018"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft <time class="dt-published" datetime="2018-08-17">17 August 2018</time></h2>
   <dl>
     <dt>This version:</dt><dd><a class="u-url" href="https://w3c.github.io/aria-practices/">https://w3c.github.io/aria-practices/</a></dd><dt>Latest published version:</dt><dd><a href="https://www.w3.org/TR/wai-aria-practices-1.1/">https://www.w3.org/TR/wai-aria-practices-1.1/</a></dd>
     <dt>Latest editor's draft:</dt><dd><a href="https://w3c.github.io/aria-practices/">https://w3c.github.io/aria-practices/</a></dd>