Issue 2707 and 3904 - Added help files to Preferences page
2707 and 3094 - Added help files to Preference sections
Revert "Issue 2707 and 3904 - Added help files to Preferences page"

This reverts commit 126b4d1a40a164e52b47f98f48dfc2d779c82ba8.
Removed empty <li> and obsolete help file
Issue 2707 and 3904 - Added help files to Preferences page
2707 and 3094 - Added help files to Preference sections
Revert "Issue 2707 and 3904 - Added help files to Preferences page"

This reverts commit 126b4d1a40a164e52b47f98f48dfc2d779c82ba8.
Merge remote-tracking branch 'origin/Issue_2707-Add_help_popups_to_Preference_page' into Issue_2707-Add_help_popups_to_Preference_page

Conflicts:
	app/views/preferences/index.html.erb
	public/help/disable-share-buttons.html
Merge pull request #662 from ariana-paris/Issue_2707-Add_help_popups_to_Preference_page

Issue 2707 add help popups to preference page