Set table border to transparent

This is to hide the image layout tables used for sponsors logos etc.

We may want to override this for the schedule tables.

See #2

Author: peterjc

assets/css/style.scss

@@ -24,7 +24,7 @@ $code-text-color: #567482;
 
 // Borders
 $border-color: #dce6f0;
-$table-border-color: #e9ebec;
+$table-border-color: transparent;
 $hr-border-color: #eff0f1;
 
 @import "{{ site.theme }}";