Update links in side nav and header

Annabel Dunstone Grayrequested to merge
22889-remove-links-from-sidebar into master
  • Remove todos, help, and project settings from sidebar
  • Remove plus icon from top right header
  • Put help link in user dropdown
  • Add lighter bg-color at the top of side nav

Screen_Shot_2016-10-27_at_3.42.55_PM Closes #22889 (closed)

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