fix contributors line breaks for marketplace preview

[yardenshoham]

Closes #547

This PR changes the contributors script and adds a line break every 16 contributors.

[PKief]

Thank you very much, I was very excited about your pull request. However, I have now decided to generate the list as an image, so that the problem on the Marketplace will also be solved. I also liked your solution very much, but it has the disadvantage that the list outside the Marketplace is not as responsive if it is displayed directly in VS Code, for example:

If it is an image, it can be scaled to 100% and this problem is solved:

Once again, I would like to thank you for your work 👍

[PKief]

By the way, you can already see the new version here:
https://github.com/PKief/vscode-material-icon-theme/blob/master/README.md

Of course, the picture has the disadvantage that you can no longer click on the individual profile pictures. I solved this by redirecting you to the GitHub page, which lists all contributors. It's a compromise one can live with, I think 😄

[yardenshoham]

By the way, you can already see the new version here:
https://github.com/PKief/vscode-material-icon-theme/blob/master/README.md

Of course, the picture has the disadvantage that you can no longer click on the individual profile pictures. I solved this by redirecting you to the GitHub page, which lists all contributors. It's a compromise one can live with, I think 😄

I believe a better solution exists. Let's use all-contributors. It's a fairly generic solution (which also break lines nicely).

[PKief]

Thanks for the advice. I will think about using an external library in the future. However, it is important to me that the readme does not need too much space for such a collection. I think that we can use the current solution quite well for now.