[docs] Add security announcements to 4.4.3 and friends

[mickhawkins]

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🔴 48	🟢 95	🟢 100	🟢 90	🟢 100	Report
/docs/4.4/apis/commonfiles	🟠 54	🟢 93	🟢 100	🟢 100	🟢 100	Report
/general/development/gettingstarted	🟠 64	🟢 95	🟢 100	🟢 90	🟢 100	Report
/general/releases	🟠 60	🟢 95	🟢 100	🟢 100	🟢 100	Report