Change codepen references to links instead of post form

[renestalder]

Based on the short discussion on Slack, I noticed that the current Codepen implementation automatically creates a pen on your account. It uses a form and a submit button to link to the pen, which, instead of opening the original pen, creates a fork on your account.

The not so beautiful side of this is also that, due to the submit button, the Codepen can't opened in a new window.

Proposal

Link to an original pen that can be forked instead of creating the pen for the user.

Possible problems

Could be that those pens do not exist yet and have to be created, as It looks like that the post actually sends the data for the pen.