OG Images arent working on Linked In

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related? https://stackoverflow.com/questions/10042786/how-to-successfully-implement-ogimage-for-linkedin

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Adding prefix="og: http://ogp.me/ns#" to the meta tags doesn't seem to fix it. Polypane not seeing any issues either

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Facebook debugger says it's good, but we're missing the og:url. Ill try add that.

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yeeesh. looks like we had a hardcoded canonical URL in the svelte template. Probably not good for SEO

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turns out Linked In was somehow side-stepping the Vercel CDN cache, so the generation was taking too long, and it was ignoring the file. Fixed it by also caching the output in Redis. This is better than memory because it spans all serverless regions

#1399