Remove hello world service

[angrybayblade]

Proposed changes

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Fixes

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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.)
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• 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

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• 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.

[jmoreira-valory]

@angrybayblade: UPDATE Changes related to docs are now on PR #2084 , rebased on this branch. So merge order should be 2084 --> this branch --> main

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (b061dff) 94.22% compared to head (64cf7a8) 94.13%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2057      +/-   ##
==========================================
- Coverage   94.22%   94.13%   -0.09%     
==========================================
  Files         262      254       -8     
  Lines       15989    15757     -232     
==========================================
- Hits        15065    14833     -232     
  Misses        924      924              

Flag	Coverage Δ
unittests	94.13% <ø> (-0.09%)	⬇️

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see 1 file with indirect coverage changes

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