Figure out why browser caches aren't updating for new website

I've seen it myself and it has been reported by many, I often have to control-refresh to get the new site. Is there something we need to add to the metadata of the site to tell browsers to clear the cache or limit it?

No file or test is named. Start by reproducing the stale-site behavior in a browser and inspect the website's published metadata and cache behavior on GitHub Pages. Done means new website content becomes visible without a control-refresh, with an appropriate cache policy identified and verified.

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