Update / remove / fix references to axelarscan.io

[StephenFluin]

There are several places with screenshots that are now out of date since the new Axelarscan UI.

• https://docs.axelar.dev/dev/general-message-passing/monitoring
• https://docs.axelar.dev/dev/general-message-passing/debug/transaction-recovery
• https://docs.axelar.dev/dev/general-message-passing/debug/debugging-your-smart-contract
• https://docs.axelar.dev/resources/axelarscan/axelarscan-add