fix: broken links reported by link checker

[gabros20]

Broken Links Report

Found by automated link checker in PR #152.

1. SSL Handshake Failed (525)

• Broken URL: https://v1.cosmos.network/sdk
• Found on: https://celestia.org/glossary/
• Issue: The Cosmos SDK v1 documentation site appears to be having SSL issues

2. 404 Not Found

• Broken URL: https://celestia.org/learn/beginners/modular-blockchains-for-beginners/glossary/state-transition-fraud-proof
• Found on: https://celestia.org/learn/beginners/modular-blockchains-for-beginners/
• Issue: Internal link pointing to non-existent glossary page

Actions needed

• Update or remove the Cosmos SDK link in the glossary
• Fix or remove the state-transition-fraud-proof glossary link in the beginners guide