Fix image paths for new blog

[teolemon]

Story

• We have the hardcoded images path for the old blog, and as a result, we can't copy paste translations as is.
• Fix image paths for new blog

Steps

• Look for the French blogpost, go in HTML mode, Copy the new url of the image, replace the old url in the files below
• 1-million-products.html
• a-clever-device-to-photograph-tins.html
• advanced-search-form-and-data-export.html
• discover-the-5 colors-A-B-C-D-E-nutrition-grade-of-X-country-products-on-openfoodfacts.html
• graphs-in-3-clicks.html
• how-many-different-food-products-are-there-in-the-world.html
• introducing-open-products-facts-all-your-product-are-belong-to-us.html
• join-our-worldwide-collaborative-effort-to-collect-info-on-the-packaging-of-food.html
• launch-of-open-food-facts-join-the-food-revolution.html
• made-near-eu-and-makes-you-curious.html
• mailing-newapp.html
• mailing-nutriscore.html
• new-mobile-app-2019.html
• open-and-linked-data-rdf-export-of-data.html
• scanning-is-already-contributing.html
• support-open-food-facts-on-helloasso-and-lilo-and-be-a-part-the-hosting-of-the-project.html
• wrapping-it-up.html