fix: GA outbound link tracking

Fixes external links opening both in current tab and new tab when `google_analytics` enabled.

Fix #1511

scripts/view_demo.sh

@@ -2,4 +2,8 @@
 
 # View the demo site on any local devices by binding the local IP on port 1315.
 # Run this script from the root Academic dir.
-HUGO_THEME=academic hugo --source exampleSite --themesDir ../../ --i18n-warnings --bind=0.0.0.0 -p 1315 --baseURL=http://0.0.0.0:1315 server
+HUGO_THEME=academic hugo \
+--source exampleSite --themesDir ../../ \
+--bind=0.0.0.0 -p 1315 --baseURL=http://0.0.0.0:1315 \
+--i18n-warnings --minify -e "development" \
+server