Create 5-levels of Stress Category Filter

[daliaramos]

• The app should identify the levels of stress using a color code on the relationships
  • The relationship stress code maps to a color in a gradient between blue and red
  • The stress color code should color the relationship arrow accordingly
• The app should allow a user to filter the levels of stress that are visible
  • On the sidebar there should be options to filter the stress levels
  • Each stress level should be a toggle button
  • When a relationship is not equal to the visible stress level(s) the relationship is invisible
  • There should be a button to show/hide all levels