Remove fake thumbnails task.
Remove fake thumbnails task.

This task was required for the Ginkgo release,
but should no longer be necessary for Hawthorn.

EDUlib/configuration,rue89-tech/configuration,edx/configuration,hks-epod/configuration,arbrandes/edx-configuration,hastexo/edx-configuration,Stanford-Online/configuration,Stanford-Online/configuration,rue89-tech/configuration,proversity-org/configuration,arbrandes/edx-configuration,appsembler/configuration,arbrandes/edx-configuration,gsehub/configuration,hks-epod/configuration,hastexo/edx-configuration,stvstnfrd/configuration,EDUlib/configuration,rue89-tech/configuration,hastexo/edx-configuration,EDUlib/configuration,Stanford-Online/configuration,rue89-tech/configuration,hks-epod/configuration,stvstnfrd/configuration,arbrandes/edx-configuration,proversity-org/configuration,hastexo/edx-configuration,EDUlib/configuration,stvstnfrd/configuration,arbrandes/edx-configuration,appsembler/configuration,gsehub/configuration,stvstnfrd/configuration,hks-epod/configuration,EDUlib/configuration,appsembler/configuration,mitodl/configuration,Stanford-Online/configuration,hastexo/edx-configuration,Stanford-Online/configuration,gsehub/configuration,hks-epod/configuration,mitodl/configuration,rue89-tech/configuration,stvstnfrd/configuration,edx/configuration,edx/configuration,proversity-org/configuration,edx/configuration,proversity-org/configuration,mitodl/configuration,gsehub/configuration,mitodl/configuration,gsehub/configuration,proversity-org/configuration,appsembler/configuration