[Story] Add a CDN to the OC app

[tschaffter]

What product(s) is this story for?

OpenChallenges

As a user, I want

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Description

Baseline results: https://www.webpagetest.org/result/231006_AiDcFA_CXS/1/experiments/#Quick

Acceptance criteria

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Tasks

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Anything else?

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Have you linked this story to a GitHub Project?

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