Issue #3386984: Fix of hamburger menu.

Sourojeet Paulrequested to merge
issue/status_zymphonies_theme-3386984:Issue#3386984-Fix-of-hamburger-menu into 1.0.x
  1. This commit fixes the issue of hamburger menu.
  2. Changes hamburger icon colour as suggested.
  3. Modified Js using Drupal Behaviours.
  4. Adds support for D8 also.

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