Added explorers URL to Chain

[ekenigs]

Description

Please explain the changes this PR addresses here.

Checklist

• If this requires a documentation change, I have created a PR that updates the mkdocs/docs directory
• If this requires it, I have updated the Readme
• If necessary, I have updated the examples
• I have verified if I need to create/update unit tests
• I have verified if I need to create/update acceptance tests
• If necessary, I have run acceptance tests on this branch in CI

[changeset-bot]

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Latest commit: 1736ab8

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