use built-in if-else to avoid unnecessary calls relativize

Author: mojavelinux

src/partials/nav-tree.hbs

@@ -10,7 +10,7 @@
     <button class="nav-toggle"></button>
     {{/if}}
     {{#if ./url}}
-    <a class="nav-link" href="{{ifelse (eq ./urlType 'internal') (relativize ./url) ./url}}">{{{./content}}}</a>
+    <a class="nav-link" href="{{#if (eq ./urlType 'internal')}}{{relativize ./url}}{{else}}{{url}}{{/if}}">{{{./content}}}</a>
     {{else}}
     <span class="nav-text">{{{./content}}}</span>
     {{/if}}