Bug 877095 - [contacts] Missplaced import switches

Remove un-used files from` /contacts/style/shared/widgets/`
Move `/contacts/style/shared/core/css/root.css` to `/contacts/style/root.css`
Relink new path in: 
`/contacts/fb_link.html`
`/contacts/import.html`
`/contacts/facebook/curtain.html`