Switch from Docker to Quay

[jason-fox]

As discussed within the TSC, badge and links for FIWARE clones of the container image should be switched to quay.io

Proposed changes

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• Bugfix (non-breaking change which fixes an issue)
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[github-actions]

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[c0c0n3]

great, thank you @jason-fox
note: the build failures are totally unrelated to this PR.