"edit" button on service provider listing page

[vincelee888]

when viewing the service provider listing page, add an "edit" button that links to the service provider details page: /service-providers.html?key={service-provider-key}. this is the same url as that used in the link around the title

https://github.com/StreetSupport/streetsupport-admin/blob/develop/src/pages/service-providers/index.hbs