LUN-705 : Fix old promo snippets not showing merling objects

- Old promo merlin objects were also hidden by One Promo snippet
- Hide uneccessary merlin fields for One Promo (ex : description, published)
LUN-705 : Moved all One Promo related js in smart snippet

- moved js admin code into smart snippet. This will truly make One Promo build independent
- moved help button,layout images into filer so they don't require build also
- checking if user is in admin page is done via the in_admin variable (see One Promo smart snippet code). This prevents js code for admin to run on actual page
LUN-705 : removed image files
Merge pull request #19 from pbs/LUN-705

Moved the hardcoded js block to the SmartSnippet