Generate navigation html only once for all pages.

This reduces the time for apidoc generation by ~30%.

config/jsdoc/api/template/publish.js

@@ -477,6 +477,7 @@ exports.publish = function(taffyData, opts, tutorials) {
   // index page displays information from package.json and lists files
   const files = find({kind: 'file'});
 
+  view.navigationHtml = helper.resolveLinks(view.partial('navigation.tmpl'));
   generate('Index',
     [{kind: 'mainpage', readme: opts.readme, longname: (opts.mainpagetitle) ? opts.mainpagetitle : 'Main Page'}].concat(files),
     indexUrl);

config/jsdoc/api/template/tmpl/layout.tmpl

@@ -92,7 +92,7 @@ var version = obj.packageInfo.version;
 </div>
 
 <div id="wrap" class="clearfix">
-    <?js= this.partial('navigation.tmpl', this) ?>
+    <?js= this.navigationHtml ?>
     <div class="main">
         <h1 class="page-title" data-filename="<?js= filename ?>"><?js= title ?></h1>
         <div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">