Add PostPeer

[itsjonathanhere]

Pull Request Template

Please ensure all items below are checked before creating a pull request:

• My changes were made in the resources folder, not in the auto-generated README.md file or db folder
• The resource is highly or exclusively related to programming and development
• My submission is formatted according to the guidelines in the contributing guide
• My submission is ordered alphabetically based on the resource name
• My submission has a useful description
• I have searched the repository for any relevant issues or pull requests

[github-actions]

New resource link: https://www.postpeer.dev/

[github-actions]

🤖 Automated PR Validation

⚠️ Issues Found

The following issues were detected. GitHub Copilot will review this PR and report any additional issues.

Resource Validation Errors

🔤 Alphabetical Order

• o.ts:29: Resource "Octotree" should come before "OrcaSheets"

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