Add nickel content

For those with hand eczema, especially of the "dishydrotic" type (with vesicles/ blisters), a low-nickel diet may be helpful, so adding that mineral into the app would be great. Until then, for those with hand eczema, you might want to avoid high nickel foods such as cocoa, oatmeal, nuts, canned food, soy, and other legumes.

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