Add a button for toggling hints

[hamzadev067]

Current Behavior

When the player writes the full word wrongly the hint gets shown
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What The Behavior Will Be

There will be a toggle hint button below the rebus when clicked it will show the hint (or hide it) and when writing the hint will disappear
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[mohamidi]

I can take this issue

[viniciusks]

I made a hint button suggestion.
Open pull request: #743