extra Help menu entries for only staff/moderators (community management links)

Adds links to the bottom of the Help menu for various documents used by staff and moderators. This links are visible to only players who have the "admin" flag set. Requested by Breadstrings in https://plus.google.com/114447825469587375506/posts/eFSCmDTsLxr

![screen shot 2014-10-03 at 8 24 57 am](https://cloud.githubusercontent.com/assets/1495809/4499464/111c99da-4a83-11e4-92ab-99386d0e6d26.png)

@lemoness : Is this okay?
Not comfortable with the documents in public code unless we restrict access
to them.
On Oct 2, 2014 9:48 PM, "Alice Harris" <notifications@github.com> wrote:

> In views/shared/header/menu.jade:
>
> > @@ -131,6 +131,14 @@ nav.toolbar(ng-controller='AuthCtrl', ng-class='{active: isToolbarHidden}')
> >                a(target="_blank" href='http://habitrpg.wikia.com/wiki/Contributing_to_HabitRPG')=env.t('contributeToHRPG')
> >              li
> >                a(target="_blank" href='http://habitrpg.wikia.com/wiki/')=env.t('overview')
> > +            li(ng-if='user.contributor.admin')
>
> @lefnire <https://github.com/lefnire> Also for lines like this?
> ul.toolbar-subscribe(ng-if='!user.purchased.plan.customerId')
>
> Change it to this?
> ul.toolbar-subscribe(ng-if='!::user.purchased.plan.customerId')
>
> I might as well do the whole file while I'm adding :: to my code.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/HabitRPG/habitrpg/pull/4103/files#r18381405>.
>