Found an answer here: https://orchard.codeplex.com/discussions/258122
Here's what I did, seems to work well but Bertrand let me know if this is wrong...
1. In Theme.txt add a Zone called Head
2. Bring in the Document.cshtml from TheThemeMachine and add @Display(Model.Head) in the <head> tag somewhere. I put it just above the </head>
3. In the Views folder add a Shape Template called Widget-Head.cshtml with the following code:
Now you can add an HTML widget to the Head zone containing your markup of choice and it will be unencumbered by the default article tags.
I hope this helps!