Consistent navigation URLs

Author: philwareham

_includes/header.html

@@ -24,13 +24,13 @@ <h1 class="masthead" itemprop="name"><a rel="home" itemprop="url" href="https://
         <a id="site-navigation-toggle" href="#" role="button" aria-controls="site-navigation">Menu</a>
         <nav id="site-navigation" aria-label="Site navigation" itemscope itemtype="https://schema.org/SiteNavigationElement">
             <ul id="site-navigation-list">
-                <li><a itemprop="url" href="https://textpattern.com/start">Get started</a></li>
+                <li><a itemprop="url" href="https://textpattern.com/start/">Get started</a></li>
                 <li class="active"><a itemprop="url" href="https://docs.textpattern.com/">Documentation</a> <span class="accessibility">(current section)</span></li>
                 <li><a itemprop="url" href="https://textpattern.com/themes">Themes</a></li>
                 <li><a itemprop="url" href="https://plugins.textpattern.com/">Plugins</a></li>
                 <li><a itemprop="url" href="https://forum.textpattern.com/">Forum</a></li>
-                <li><a itemprop="url" href="https://textpattern.com/weblog">Blog</a></li>
-                <li><a itemprop="url" href="https://textpattern.com/about">About</a></li>
+                <li><a itemprop="url" href="https://textpattern.com/weblog/">Blog</a></li>
+                <li><a itemprop="url" href="https://textpattern.com/about/">About</a></li>
             </ul>
         </nav>
     </div>