WP-5017 Add WP Accessibility Accreditation link

[dravek]

• Add WP Accessibility Accreditation link and date to the Accessibility page in dev docs

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 76	🟢 95	🟢 100	🟢 90	🟢 100	Report
/docs/4.4/apis/commonfiles	🟠 68	🟢 93	🟢 100	🟢 100	🟢 100	Report
/general/development/gettingstarted	🟠 76	🟢 95	🟢 100	🟢 90	🟢 100	Report
/general/releases	🟠 78	🟢 95	🟢 100	🟢 100	🟢 100	Report