Add flower-field, deprecate minesweeper

[kahgoh]

This replaces minesweeper with flower-field

See https://forum.exercism.org/t/suggestion-deprecate-minesweeper-for-flower-field/17967/22

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Automated comment created by PR Commenter 🤖.

[jiegillet]

Thank you for the contribution. The tests seem to be missing though!

[jiegillet]

Flower power 🌹🌹🌹