Movies posters should be in images folder

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@Anikkkkettt, in order to reduce the size and weight of the pictures (already 16Mo and going up) and to have a complete and viable project, better to not use remote images.

You must tell people to download on their computer the image, resize it to something like 688x1000 and save it as JPG in the images folder.

The only thing you should do is edit the README.md to guide contributors to use posters as files and not URLs.

At the moment, you only have one contributor who did that with the Red Scorpion movie and two new open Pull Requests who did that too. If you want, you can assign me to this issue and I will process the already submitted movies to make them files, or you can leave open this issue in order for anyone to pick it 😉