Fix broken link in latest blog

[Devr-pro]

Fix broken link of $derived

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[Rich-Harris]

Thank you. I'm going to hold off on merging this for now, because this broken link should already be causing deployments to fail — the fact that it isn't is something that needs to be investigated

[Rich-Harris]

merged #804, so I'll close this. Investigating this led to a discovery that we're missing protection against many other broken links, so it was very much appreciated!