[Release] External resource links, E2E testing setup

[daine]

Summary | Résumé

• 296

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• 408 (this is not in production)

⚠️ This PR can be tested through the following URL(s):

Main - https://staging.resources.alpha.canada.ca/ EN - https://staging.resources.alpha.canada.ca/ FR - https://staging.ressources.alpha.canada.ca/fr/

After merge, do this:

From your terminal, make sure you are in the main branch, then type

git tag -a v2.4.0 -m "External resource links, E2E testing setup"
git push --tags

This bumps up the release version