Changes to the left hand sidebar
  Modified CSS to remove unwanted whitespace.

  *horizon/templates/horizon/common/_sidebar.html
    Removed unwanted whitespace.
  *openstack_dashboard/templates/_header.html
    Removed a few icons which were not adding any functionality.
  *horizon_jiocloud/jio_cloud/static/dashboard/css/css/responsive.css
  *openstack_dashboard/static/jio_cloud/assets/css/responsive.css
    Removed some padding/margin elements which were introducing whitespace.

Implements: blueprint redesign-jio-dashboard-landing-page