Rethink the per-square actions

Currently when you mouse with a square, the only option is either to mint that square or go to the linked website.

@ritorhymes has some improvements in this UI shown at https://github.com/su-squares/tenthousandsu.com/pull/52 / https://su.ritovision.com/

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Click an empty white square below to mint an available Su Square (0.5 ETH). Or click a filled-in square square to show more information and visit its hyperlink.

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One idea ^

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Below is an update we could use:

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