Remove "Documentation" link from admin menu

We decided to remove the Documentation link for now. Do so.

mpicms/base/wagtail_hooks.py

@@ -39,12 +39,6 @@ def register_h1_feature(features):
 def register_site_button():
     return MenuItem(_('View website'), '/?', classnames='icon icon-site', order=1)  # Without the ? Wagtail applies different CSS 
 
-
-@hooks.register('register_admin_menu_item')
-def register_docs_link():
-    return MenuItem(_('Documentation'), reverse('docs'), classnames='icon icon-help', order=10000)
-
-
 @hooks.register('after_edit_page')
 def send_notifications(request, page):
     subscribers = [user.email for user in page.subscribers.exclude(id=request.user.id)]