Change hunger games link to new interface

[VaiTon]

We should change the links to /hunger-game to hunger.openfoodfacts.org.

The syntax is kind of different:
https://hunger.openfoodfacts.org/questions?type={TYPE}&value_tag={NAME}
where type can be: label, category, brand, product_weight

[CharlesNepote]

Thanks @VaiTon, you're right.

1. We have to change the link in the left column.
2. We could also add contextual links related to the product. E.g. if it has a brand we could link to Hunger Game's suggestions for this brand.

[CharlesNepote]

This is fixed indeed.