Makes get started button blue as suggested by Alisa

[SaptakS]

Description

Changes the button color on the hero banner of contributor landing page to blue from green

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

Testing

Refers/Fixes

[codecov]

Codecov Report

Merging #1718 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1718   +/-   ##
=======================================
  Coverage   29.16%   29.16%           
=======================================
  Files         134      134           
  Lines       10065    10065           
  Branches     1319     1319           
=======================================
  Hits         2935     2935           
  Misses       7025     7025           
  Partials      105      105

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[thelostone-mc]

LGTM !
Thanks for the contributon Sankalp ^_^