Just prior to 3.0.4, new instructions were added for the Gerrit hosting

service, pointing to the installation docs. This resulted in a bad call

to interpolate(), breaking the JavaScript on the page. This change

fixes that bad call.
I've also updated it to open instructions in a new tab, so people's

forms don't get erased.

Checked the page. No more JavaScript errors, and the instructions and

link worked (and opened in a new tab).