Add Dataforgood logo and update contributors list

[benoit-cty]

We need to update this website to :

• Have section for former contributors
• Add a new section above for current main contributors
• Add a section with a like to all contributors on Github
• Have a section to thanks Mozilla, Clever Cloud and DataForGood or their support
• Link to the technical documentation : https://mlco2.github.io/codecarbon/
• Link to the Dashboard : https://dashboard.codecarbon.io/
• Better emphasis that it is an OpenSource project, everything is free, even the API access. So use it responsibly.

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• There is https://github.com/mgechev/github-contributors-list but it's a Node script.