[ Flower Field ] Deprecate minesweeper for flower-field

[habere-et-dispertire]

See:
https://forum.exercism.org/t/suggestion-deprecate-minesweeper-for-flower-field/17967

[github-actions]

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[habere-et-dispertire]

PR for new icon:

exercism/website-icons#198

[habere-et-dispertire]

Greener exercise icon

[SleeplessByte]

Thanks once again @habere-et-dispertire !