Redesign/course unit

[simaopsbarbosa]

Closes #1376

Current State

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Final Mockup

Below is the mockup illustrating the desired final state :

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Review checklist

• Terms and conditions reflect the current change
• Contains enough appropriate tests
• If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• Properly adds an entry in changelog.md with the change
• If PR includes UI updates/additions, its description has screenshots
• Behavior is as expected
• Clean, well-structured code

[codecov]

Codecov Report

Attention: Patch coverage is 3.26531% with 237 lines in your changes missing coverage. Please review.

Project coverage is 11%. Comparing base (57c4fdd) to head (1ecda0e).
Report is 126 commits behind head on ui/redesign.

Additional details and impacted files

@@             Coverage Diff              @@
##           ui/redesign   #1407    +/-   ##
============================================
- Coverage           12%     11%    -0%     
============================================
  Files              271     272     +1     
  Lines             7341    7557   +216     
============================================
+ Hits               812     830    +18     
- Misses            6529    6727   +198