Add a footer variant that provides a way to credit organisations for their contributions

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For example, to recognise code4iati's contribution to the Dashboard through the Analytics project, for ODS/code4iati on IATI Tables, and in the future PWYF for a potential bit of Dashboard code.

I kinda envisage this as either a specific variant of the Additional Information layer, or a slim full-width component that acts as a bit of a logo wall type thing