Release 2.28 Updates

[larswmh]

• [ ] Screenshots
• [ ] Gulpfile
• [ ] Sitemap
• [ ] Update FAQ/Glossary articles
• [ ] Blog

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Other new or updated content (some updates are unrelated to release 2.28)

• https://github.com/corona-warn-app/cwa-website/pull/3113
• https://github.com/corona-warn-app/cwa-website/pull/3114
• https://github.com/corona-warn-app/cwa-website/pull/3116
• https://github.com/corona-warn-app/cwa-website/pull/3117
• https://github.com/corona-warn-app/cwa-website/pull/3118
• https://github.com/corona-warn-app/cwa-website/pull/3119
• https://github.com/corona-warn-app/cwa-website/pull/3122
• https://github.com/corona-warn-app/cwa-website/pull/3123
• https://github.com/corona-warn-app/cwa-website/pull/3118

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