Added modal JS to webpack code

Signed-off-by: Martin Lowe martin.lowe@eclipse-foundation.org

I see this as a phase 1 of modal additions to the solstice assets. For phase 2, I could see us adding a mustache template as an optional render of the modal interior. This will give us more flexibility around data that is written to the page.

We could load attributes in via a data() call on the related target, and adding the body to the returned object as we do currently. This object would be passed into the mustache engine and render the modal content on the fly. This would allow us to reuse the singular modal container for any pop out across the site.