Added activation_complete template
Added activation_complete template

When clicking on an activation link, after verification,
the registration application tries to show
the activation_complete page. The template was missing,
so I added a basic skeleton.

Signed-off-by: Alexandru DAMIAN <dca11ad146909de2e237c885165c72737f425f51@intel.com>

bartosh/layerindex-web,bartosh/layerindex-web,bartosh/layerindex-web