Improve usability for web contribution

[CloCkWeRX]

Problem

Prior to the redesign, there were links to the product states featured, and a power user could more or less create lists like "photos available, brands not completed"

Now the main pathway is... a single contribute link under "complete products" which leads to a wiki page

https://world.openfoodfacts.org/help-complete-products

Which in turn has one small link to the (global) products to be completed: https://world.openfoodfacts.org/state/to-be-completed

From here:

• There's a lot of brands I never encounter as they aren't in my locale
• I can't add photos of products I can't buy

Proposed solution

1. Improve https://world.openfoodfacts.org/help-complete-products to direct users to their country first
2. Consider linking to hunger games (#9099)
3. Include a 'top 10' curated list of premade searches, for quality issues or missing information but photos available, localised to an area