[r22576]Move the HTML resources from gramps/plugins/webstuff

To data and images so that they're together with the other resources
instead of in site-package/gramps. Aside from a better source and
installation layout, this makes it easier to bundle them.

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@22577 4ae1f11a-8b86-4847-b8af-ab372f36d1fd