Added highlight on answers exercise

[sumandari]

This is to address #1292

• The highlight feature will be available to the authenticated user (and admin).
• Disabled the click event when answers have been submitted.

[codecov[bot]]

Codecov Report

Merging #1350 (e4d826a) into develop (dcbe8a8) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1350   +/-   ##
========================================
  Coverage    63.94%   63.94%           
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  Files          180      180           
  Lines         9622     9622           
  Branches       751      751           
========================================
  Hits          6153     6153           
  Misses        3227     3227           
  Partials       242      242           

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[NyakudyaA]

LGTM @sumandari , Can we get a tooltip on the Check your knowledge Icon to let users know they can click on the answer to select their choice or is it already catered for somewhere

[sumandari]

Added Tooltip: