feat: decommissionate sgd

[scolladon]

What does this pull request contains

It removes legacy sgdcommand

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• Added for new features.
• Changed for changes in existing functionality.
• Deprecated for soon-to-be removed features.
• Removed for now removed features.
• Fixed for any bug fixes.
• Security in case of vulnerabilities.

Explain your changes

Remove executable files, related tests and mention in the documentation

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[codecov]

Codecov Report

Merging #221 (a803b61) into main (d87fac3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #221   +/-   ##
=======================================
  Coverage   98.63%   98.63%           
=======================================
  Files          22       22           
  Lines         585      585           
=======================================
  Hits          577      577           
  Misses          8        8           

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[codeclimate]

Code Climate has analyzed commit a803b61 and detected 0 issues on this pull request.

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