Fix site.baseurl usage

Author: eemeli

404.html

@@ -6,5 +6,5 @@
 
 <div class="page">
   <h1 class="page-title">404: Page not found</h1>
-  <p class="lead">Sorry, we've misplaced that URL or it's pointing to something that doesn't exist. <a href="{{ site.baseurl }}">Head back home</a> to try finding it again.</p>
+  <p class="lead">Sorry, we've misplaced that URL or it's pointing to something that doesn't exist. <a href="{{ site.baseurl }}/">Head back home</a> to try finding it again.</p>
 </div>

_includes/head.html

@@ -15,9 +15,9 @@
   </title>
 
   <!-- CSS -->
-  <link rel="stylesheet" href="{{ site.baseurl }}public/css/poole.css">
-  <link rel="stylesheet" href="{{ site.baseurl }}public/css/syntax.css">
-  <link rel="stylesheet" href="{{ site.baseurl }}public/css/hyde.css">
+  <link rel="stylesheet" href="{{ site.baseurl }}/public/css/poole.css">
+  <link rel="stylesheet" href="{{ site.baseurl }}/public/css/syntax.css">
+  <link rel="stylesheet" href="{{ site.baseurl }}/public/css/hyde.css">
   <link rel="stylesheet" href="//fonts.googleapis.com/css?family=PT+Sans:400,400italic,700|Abril+Fatface">
 
   <!-- RSS -->

_includes/sidebar.html

@@ -2,15 +2,15 @@
   <div class="container sidebar-sticky">
     <div class="sidebar-about">
       <h1>
-        <a href="{{ site.baseurl }}">
+        <a href="{{ site.baseurl }}/">
           {{ site.title }}
         </a>
       </h1>
       <p class="lead">{{ site.description }}</p>
     </div>
 
     <nav class="sidebar-nav">
-      <a class="sidebar-nav-item{% if page.url == site.baseurl %} active{% endif %}" href="{{ site.baseurl }}">Home</a>
+      <a class="sidebar-nav-item{% if page.url == site.baseurl %} active{% endif %}" href="{{ site.baseurl }}/">Home</a>
 
       {% comment %}
         The code below dynamically generates a sidebar nav of pages with