feat: support design tokens and paragon 23

[dcoa]

Warning

This PR should not be merge to master directly, it should point to master-design-tokens once the branch has been created.

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

Changes implemented

• Replace Paragon SCSS variables with CSS variables.
• Replace deprecated components (Input, Modal, +/- font-awesome icons)

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
• chore: update paragon to a version to 23 frontend-lib-special-exams#159

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[bradenmacdonald]

Nice, thanks! Let me know when this is ready for review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.18%. Comparing base (4cc716b) to head (631f420).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1588      +/-   ##
==========================================
- Coverage   90.18%   90.18%   -0.01%     
==========================================
  Files         338      338              
  Lines        5726     5725       -1     
  Branches     1382     1381       -1     
==========================================
- Hits         5164     5163       -1     
- Misses        543      545       +2     
+ Partials       19       17       -2     

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[open-craft-grove]

Sandbox deployment failed 💥
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[open-craft-grove]

Sandbox deployment failed 💥
Please check the settings and requirements.
Retry deployment by pushing a new commit or updating the requirements/settings in the pull request's description.
📜 Failure Logs
ℹ️ Grove Config, Tutor Config, Tutor Requirements