fix: Accessing colors from scss

[tuliomir]

After the react-scripts upgrade on #426 the colors on the loading component were incorrect. This was tracked to a known issue on CRA v4 that is currently not fixed on the stable release and probably will be available only on v5 onwards.

The chosen workaround for this bug was to rename the index.scss file to index.module.scss so that the current configurations of react-scripts can identify it and load its data correctly to the application.

To minimize future impacts related to scss interaction, this interface was also centralized and sanitized on the constants file.

Acceptance Criteria

• Exported colors from the scss file should be retrieved from javascript context

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9c887af) 9.20% compared to head (e276956) 9.21%.
Report is 1 commits behind head on dev.

Additional details and impacted files

@@          Coverage Diff          @@
##             dev    #510   +/-   ##
=====================================
  Coverage   9.20%   9.21%           
=====================================
  Files        112     112           
  Lines       5246    5253    +7     
  Branches     696     696           
=====================================
+ Hits         483     484    +1     
- Misses      4102    4108    +6     
  Partials     661     661           

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