add darkBlue colour to theming

[joshuadkitenge]

Description

ral-facilities/inventory-management-system/issues/357

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• Review code
• Check Actions build
• Review changes to test coverage
• {more steps here}

Agile board tracking

closes ral-facilities/inventory-management-system/issues/357

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.71%. Comparing base (493b967) to head (7e904bf).

Additional details and impacted files

@@               Coverage Diff               @@
##           react-18-#1205    #1375   +/-   ##
===============================================
  Coverage           96.71%   96.71%           
===============================================
  Files                  48       48           
  Lines                1766     1767    +1     
  Branches              495      495           
===============================================
+ Hits                 1708     1709    +1     
  Misses                 54       54           
  Partials                4        4           

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[joelvdavies]

Tested with ral-facilities/inventory-management-system#363.