chore: Migrate tutorial to the Verax GitHub organization

[alainncls]

What does this PR do?

• Removes the tutorialpackage from the monorepo
• Migrates the tutorial to its own repo in the Verax GitHub organization

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

• Unit tests for any smart contract change
• Contracts and functions are documented

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.95%. Comparing base (19fbace) to head (8d8d198).

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #618       +/-   ##
===========================================
- Coverage   92.53%   81.95%   -10.59%     
===========================================
  Files          30       30               
  Lines         482      482               
  Branches      114      114               
===========================================
- Hits          446      395       -51     
+ Misses         24       23        -1     
- Partials       12       64       +52     

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[orbmis]

What's the eli5 of this PR @alainncls ?