Make template usage graph take up 100% of width

The bars were sitting in a table cell with some right padding, so they
never extended all the way to the right. Making it right-aligned removes
this padding, then setting the text to left aligned keeps things looking
the same.

app/assets/stylesheets/views/dashboard.scss

@@ -32,6 +32,7 @@
   margin-bottom: $gutter-half;
   height: $gutter-half;
   color: $text-colour;
+  text-align: left;
 
   span {
     box-sizing: border-box;