[site] Redirect docs/* to next version

[andrewnicols]

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 79	🟢 95	🟢 100	🟢 90	🟢 100	Report
/docs/5.0/apis/commonfiles	🟠 56	🟢 93	🟢 100	🟢 100	🟢 100	Report
/general/development/gettingstarted	🟠 61	🟢 95	🟢 100	🟢 90	🟢 100	Report
/general/releases	🟠 52	🟢 95	🟢 100	🟢 100	🟢 100	Report