Fix typo in github url.

Author: TeresiaOlsson

_config.yml

@@ -25,7 +25,7 @@ title                    : "Python Accelerator Middle Layer"
 title_separator          : "|"
 subtitle                 : # site tagline that appears below site title in masthead
 description              : "Website for the Python Accelerator Middle Layer collaboration."
-url                      : https://python-accelerator-middle-layer.github.io"
+url                      : https://python-accelerator-middle-layer.github.io
 baseurl                  : # the subpath of your site, e.g. "/blog"
 repository               : "python-accelerator-middle-layer/python-accelerator-middle-layer.github.io"
 teaser                   : # path of fallback teaser image, e.g. "/assets/images/500x300.png"