Check link isExternal before adding target="_blank" (#1211)

Paul Trotter

2024-06-17 42640bceb57c450d5c2427bd2b449827468d0ede

 quartz/styles/base.scss

@@ -485,6 +485,7 @@
ol.overflow {
  max-height: 400;
  overflow-y: auto;
  position: relative;

  // clearfix
  content: "";