Fix nginx security headers

[dexter-sim]

Description

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Changes

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Resolves #<issue_number>

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.13%. Comparing base (7d15bc8) to head (234d789).
Report is 1 commits behind head on staging.

Additional details and impacted files

@@           Coverage Diff            @@
##           staging     #182   +/-   ##
========================================
  Coverage    91.13%   91.13%           
========================================
  Files           27       27           
  Lines         1410     1410           
  Branches       244      244           
========================================
  Hits          1285     1285           
  Misses         110      110           
  Partials        15       15           

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