Fix links by removing slash between site.baseurl and post.url

This avoids generating URLs with two leading slashes which results
in unexpected behaviour. Example:

    //2018/01/29/

was converted to

    0.0.7.226/01/29/

Fixes #617

_i18n/es/index.md

@@ -114,7 +114,7 @@
                               {% for post in site.posts limit:2 %}
                               <div class="row start-xs">
                                                     <div class="col">
-                                                        <p><a href="{{site.baseurl}}/{{ post.url }}">{{ post.title }}</a></p>
+                                                        <p><a href="{{site.baseurl}}{{ post.url }}">{{ post.title }}</a></p>
                                                     </div>
                                                 </div>
                               {% endfor %}

_i18n/template/index.md

@@ -119,7 +119,7 @@
                               {% for post in site.posts limit:2 %}
                               <div class="row start-xs">
                                                     <div class="col">
-                                                        <p><a href="{{site.baseurl}}/{{ post.url }}">{{ post.title }}</a></p>
+                                                        <p><a href="{{site.baseurl}}{{ post.url }}">{{ post.title }}</a></p>
                                                     </div>
                                                 </div>
                               {% endfor %}