docs: fix AEP DTP link

[tharune]

Summary

• replace AEP-11's stale Data Transfer Project domain with the active dtinit/data-transfer-project repository

Verification

• confirmed https://datatransferproject.dev returns 404
• confirmed https://github.com/dtinit/data-transfer-project returns 200 and is the active Data Transfer Project repository
• ran git diff --check

[tharune]

Closing this wrong-repo AEP mirror PR per maintainer guidance. Recreated against the source AEP repo here: akash-network/AEP#108