Remove hello-world docs

[jmoreira-valory]

Proposed changes

• Remove hello-world docs
• Modify linter scripts to manage the moved references
• Minor changes on documentation related to FAQ

Fixes

If it fixes a bug or resolves a feature request, be sure to link to that issue.

Types of changes

What types of changes does your code introduce? (A breaking change is a fix or feature that would cause existing functionality and APIs to not work as expected.)
Put an x in the box that applies

• Non-breaking fix (non-breaking change which fixes an issue)
• Breaking fix (breaking change which fixes an issue)
• Non-breaking feature (non-breaking change which adds functionality)
• Breaking feature (breaking change which adds functionality)
• Refactor (non-breaking change which changes implementation)
• Messy (mixture of the above - requires explanation!)

Checklist

Put an x in the boxes that apply.

• I have read the CONTRIBUTING doc
• I am making a pull request against the main branch (left side). Also you should start your branch off our main.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have locally run services that could be impacted and they do not present failures derived from my changes
• Public-facing documentation has been updated with the changes affected by this PR. Even if the provided contents are not in their final form, all significant information must be included.
• Any backwards-incompatible/breaking change has been clearly documented in the upgrading document.

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[jmoreira-valory]

Moved to FAQ (questions_and_answers.md)

[jmoreira-valory]

Moved to FAQ (questions_and_answers.md)

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (c8d96fd) 94.13% compared to head (8c85235) 94.12%.

Additional details and impacted files

@@                     Coverage Diff                      @@
##           chore/remove-hello-world    #2084      +/-   ##
============================================================
- Coverage                     94.13%   94.12%   -0.01%     
============================================================
  Files                           254      254              
  Lines                         15757    15757              
============================================================
- Hits                          14833    14832       -1     
- Misses                          924      925       +1     

Flag	Coverage Δ
unittests	94.12% <ø> (-0.01%)	⬇️

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see 1 file with indirect coverage changes

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