[WIP] feat: support design tokens and paragon 23

[dcoa]

This PR updates frontend app ora to support CSS variables and the corresponding paragon design tokens.

Changes implemented

• Replace Paragon SCSS variables with CSS variables.
• Update frontend build

Important

This PR requires a compatible version with paragon 23 of dependencies because of that the following PRs need to be merged first:

• feat: adds support for loading external theme CSS for MFEs  frontend-platform#689
• feat: update dependecies that support css variables frontend-plugin-framework#105
• [BD-46] feat: added support Paragon design tokens frontend-component-header#351
• [BD-46] feat: added support Paragon design tokens frontend-component-footer#303

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.29%. Comparing base (c83f83b) to head (6d8727c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #279   +/-   ##
=======================================
  Coverage   89.29%   89.29%           
=======================================
  Files         143      143           
  Lines        2205     2205           
  Branches      477      476    -1     
=======================================
  Hits         1969     1969           
- Misses        222      226    +4     
+ Partials       14       10    -4     

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