24 September 2013
There are two steps for static files to get included in the package:
Adding an item to the solution is fairly simple: just right click on the containing folder, then choose Add > Existing Item, then look for the file you wish to add and add it. Note that even if a css / js file is not added to the solution, it will get loaded during debugging but will not be included in the deployment package. This situation rarely happens, but if it does, it is usually detected late.
After following those steps, all the needed files will be included in the deployment package.