Certificates update

[rotimi-best]

Feature Description

1. We updated the last 2 certificates to have date and signature placeholder.
2. We must also update the code on the backend of the certificate.
3. Add the new certificates created in the figma. https://www.figma.com/file/jGpo62JSykdqBAKYQ8iiDg/Classroomio-Web?type=design&node-id=5421-26154&mode=design&t=1EwYGdsIKjHz1lxF-0

Use Case

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Proposed Solution

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Alternatives (optional)

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Additional Context

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• [ ] I have searched the existing feature requests to make sure this is not a duplicate.
• [ ] I have provided a detailed description of the requested feature.
• [ ] I have explained the use case or scenario for this feature.
• [ ] I have included any relevant technical details or design suggestions.
• [ ] I understand that this is a suggestion and that there is no guarantee of implementation.

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