Correct staff number on website

This updates the number to be the same as it is today on
coops.tech (the wordpress site). There's some extra work to do to make
this "dynamic" in https://git.coop/cotech/website/issues/73.

index.html

@@ -15,7 +15,7 @@ layout: home
       <div class="small-3 columns">
         <img src="{{ site.github.url }}/app/themes/coop-tech-oowp-theme/public/img/icon-staff.png" class="float-center">
         <h6>Staff</h6>
-        <h5>159+</h5>
+        <h5>253+</h5>
       </div>
       <div class="small-3 columns">
         <img src="{{ site.github.url }}/app/themes/coop-tech-oowp-theme/public/img/icon-revenue.png" class="float-center">