editor.js: make links open in a new page/tab
editor.js: make links open in a new page/tab

When we hit the back button, it overwrites the query. This is annoying.

Signed-off-by: Daniel Halperin <1a02732a15f637c31107256cbee5819e36aa7c67@cs.washington.edu>

uwescience/myria-web,uwescience/myria-web,uwescience/myria-web,uwescience/myria-web