remove the space in names of "site" (alshedivat#2188)

I removed the spaces between the first, middle and last names in the
header.

It's just my preference, I don't know if it would be accepted but I have
done this for my own page using this repository as a template.

_includes/header.liquid

@@ -8,12 +8,10 @@
             {% if site.first_name %}
               <span class="font-weight-bold">
                 {{- site.first_name -}}
-                &nbsp;</span
-              >
+              </span>
             {% endif %}
             {% if site.middle_name %}
               {{- site.middle_name -}}
-              &nbsp;
             {% endif %}
             {% if site.last_name %}
               {{- site.last_name -}}