[docs-infra] Reduce description max-length

[oliviertassinari]

Enforce max length in code, from 170 down to 160. I suspect we should go as far as 150, but maybe for another time.

See https://www.reddit.com/r/SEO/comments/14rc47l/meta_description_too_long_advice/. Meta descriptions are not used for SEO, but to improve the CTR on the search result. So if they are truncated, it defeats their purpose;

"nextjs 15 release", fits

"material ui v6 release", doesn't fit

I suspect that https://nextjs.org/blog/ are authors in the same underlying infra as https://vercel.com/blog/, but show in a different URL path. It's not a coincidence that all their posts's descriptions are short. This might look like a detail, but I think it's this kind of depth of execution difference that compounds and separates the great UX from the good ones.

Saw this from https://app.ahrefs.com/site-audit/2944028/data-explorer?columns=pageRating%2Curl%2Ctraffic%2ChttpCode%2Cdepth%2CmetaDescription%2CmetaDescriptionLength%2CnrMetaDescription%2Ccompliant&current=30-08-2024T023527&filterId=2864d4a78dbccdda9cf9629aa273bd61&issueId=c64d56c9-d0f4-11e7-8ed1-001e67ed4656.

[mui-bot]

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[samuelsycamore]

Good call 👍 This is also a good reminder that these kinds of best practices should be documented on Notion for future reference.