Fix tab navigation styles (#1696)

* Fix tabnav styles on #create and #edit views

The Primer CSS-provided `tabnav` styles were not being used on the Edit
and Preview tabs on the create and edit pages.

After following Primer's documentation [1], it looks like we were using
the `aria-current` attribute incorrectly. Dynamically adding/removing
this attribute on the selected tab fixes the issue.

[1]: https://primer-css-git-next-inputs.primer.now.sh/css/components/navigation#tabnav

* Recompile static assets

lib/gollum/public/assets/.sprockets-manifest-de7bb79aec424e55af1acdcc4237b301.json

@@ -1 +1 @@
-{"files":{"app-7a4bd115f4bc7ece39bc8073ca0ffad7c5e55cc5837b1464a12dead4905cefb2.js":{"logical_path":"app.js","mtime":"2021-03-23T13:37:58+05:00","size":135925,"digest":"7a4bd115f4bc7ece39bc8073ca0ffad7c5e55cc5837b1464a12dead4905cefb2","integrity":"sha256-ekvRFfS8fs45vIBzyg/618XlXMWDexRkoS3q1JBc77I="},"editor-db10c8351306e92f1926ba225d0cd9c8e886482b3b9820a85825ec3abab5f1cf.js":{"logical_path":"editor.js","mtime":"2021-01-05T19:44:49+05:00","size":744866,"digest":"db10c8351306e92f1926ba225d0cd9c8e886482b3b9820a85825ec3abab5f1cf","integrity":"sha256-2xDINRMG6S8ZJroiXQzZyOiGSCs7mCCoWCXsOrq18c8="},"app-ad43ca64b295d8444b10f22ee868f18429268af498f1bc515434878b690e37a2.css":{"logical_path":"app.css","mtime":"2021-03-23T13:38:56+05:00","size":396615,"digest":"ad43ca64b295d8444b10f22ee868f18429268af498f1bc515434878b690e37a2","integrity":"sha256-rUPKZLKV2ERLEPIu6GjxhCkmivSY8bxRVDSHi2kON6I="},"criticmarkup-31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4.css":{"logical_path":"criticmarkup.css","mtime":"2021-01-05T19:44:49+05:00","size":646,"digest":"31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4","integrity":"sha256-Ma5dMoK7uOe3w8mRfp+2jjMVprSnXabOxI0huIRpBcQ="},"print-512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb.css":{"logical_path":"print.css","mtime":"2021-01-05T19:44:49+05:00","size":75,"digest":"512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb","integrity":"sha256-USSYw2i+DT+xuhBd+oQomuSDgOyfy++Ui9TiOwsJW/s="}},"assets":{"app.js":"app-7a4bd115f4bc7ece39bc8073ca0ffad7c5e55cc5837b1464a12dead4905cefb2.js","editor.js":"editor-db10c8351306e92f1926ba225d0cd9c8e886482b3b9820a85825ec3abab5f1cf.js","app.css":"app-ad43ca64b295d8444b10f22ee868f18429268af498f1bc515434878b690e37a2.css","criticmarkup.css":"criticmarkup-31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4.css","print.css":"print-512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb.css"}}
+{"files":{"app-0fd228e26bfbe6fe31a2da268eb0e98e780c1191c1a918adf383377946e9c838.js":{"logical_path":"app.js","mtime":"2021-03-23T08:40:11-07:00","size":136020,"digest":"0fd228e26bfbe6fe31a2da268eb0e98e780c1191c1a918adf383377946e9c838","integrity":"sha256-D9Io4mv75v4xotomjrDpjngMEZHBqRit84M3eUbpyDg="},"editor-db10c8351306e92f1926ba225d0cd9c8e886482b3b9820a85825ec3abab5f1cf.js":{"logical_path":"editor.js","mtime":"2021-02-24T23:16:14-08:00","size":744866,"digest":"db10c8351306e92f1926ba225d0cd9c8e886482b3b9820a85825ec3abab5f1cf","integrity":"sha256-2xDINRMG6S8ZJroiXQzZyOiGSCs7mCCoWCXsOrq18c8="},"app-ad43ca64b295d8444b10f22ee868f18429268af498f1bc515434878b690e37a2.css":{"logical_path":"app.css","mtime":"2021-03-23T08:40:11-07:00","size":396615,"digest":"ad43ca64b295d8444b10f22ee868f18429268af498f1bc515434878b690e37a2","integrity":"sha256-rUPKZLKV2ERLEPIu6GjxhCkmivSY8bxRVDSHi2kON6I="},"criticmarkup-31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4.css":{"logical_path":"criticmarkup.css","mtime":"2021-02-24T23:16:14-08:00","size":646,"digest":"31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4","integrity":"sha256-Ma5dMoK7uOe3w8mRfp+2jjMVprSnXabOxI0huIRpBcQ="},"print-512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb.css":{"logical_path":"print.css","mtime":"2021-02-24T23:16:14-08:00","size":75,"digest":"512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb","integrity":"sha256-USSYw2i+DT+xuhBd+oQomuSDgOyfy++Ui9TiOwsJW/s="}},"assets":{"app.js":"app-0fd228e26bfbe6fe31a2da268eb0e98e780c1191c1a918adf383377946e9c838.js","editor.js":"editor-db10c8351306e92f1926ba225d0cd9c8e886482b3b9820a85825ec3abab5f1cf.js","app.css":"app-ad43ca64b295d8444b10f22ee868f18429268af498f1bc515434878b690e37a2.css","criticmarkup.css":"criticmarkup-31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4.css","print.css":"print-512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb.css"}}

lib/gollum/public/gollum/javascript/gollum.js.erb

@@ -380,8 +380,12 @@ $(document).ready(function() {
       active_tab = '#edit.tabnav-tab';
     }
 
+    $('.tabnav-tab.selected').removeAttr('aria-current');
     $('.tabnav-tab.selected').removeClass('selected');
+
+    $(active_tab).attr('aria-current', 'page');
     $(active_tab).addClass('selected');
+
     $('.tabnav-div').hide();
     $(active_div).show();
   }

lib/gollum/templates/create.mustache

@@ -4,13 +4,15 @@
   <h1 class="py-4">Create New Page</h1>
 </div>
 <div id="wiki-content" class="create edit">
-	<div class="tabnav">
-	  <nav class="tabnav-tabs" aria-label="Foo bar">
-	    <a href="#" id="edit" class="tabnav-tab selected" aria-current="edit">Edit</a>
-	    <a href="#" id="preview" class="tabnav-tab" aria-current="preview">Preview</a>
-	  </nav>
-	</div>
-	
+  <div class="tabnav">
+    <nav class="tabnav-tabs" aria-label="Toggle edit or preview mode">
+      <a href="#" id="edit" class="tabnav-tab selected" aria-current="page">
+        Edit
+      </a>
+      <a href="#" id="preview" class="tabnav-tab">Preview</a>
+    </nav>
+  </div>
+
   <div class="has-sidebar tabnav-div" id="edit-content">
     {{>editor}}
   </div>

lib/gollum/templates/edit.mustache

@@ -5,8 +5,10 @@
 </div>
 <div class="tabnav">
   <nav class="tabnav-tabs">
-    <a href="#" id="edit" class="tabnav-tab selected" aria-current="edit">Edit</a>
-    <a href="#" id="preview" class="tabnav-tab" aria-current="preview">Preview</a>
+    <a href="#" id="edit" class="tabnav-tab selected" aria-current="page">
+      Edit
+    </a>
+    <a href="#" id="preview" class="tabnav-tab">Preview</a>
   </nav>
 </div>
   <div class="tabnav-div" id="edit-content">{{>editor}}</div>