Update design of GDPR banners on subsites

[cjyabraham]

As per new design implemented on www.cncf.io, propagate to all other sites.

• [x] https://www.cncf.io/
• [ ] https://jobs.cncf.io/
• [ ] https://contribute.cncf.io/
• [ ] https://glossary.cncf.io/
• [ ] https://maturitymodel.cncf.io/
• [ ] https://tag-app-delivery.cncf.io/
• [ ] https://tag-env-sustainability.cncf.io/
• [ ] https://tag-runtime.cncf.io/
• [ ] https://tag-security.cncf.io/