chore: APP-252 use mintscan as block explorer

[blushi]

Description

https://regennetwork.atlassian.net/browse/APP-252

DO NOT MERGE from Github, follow instructions in https://www.notion.so/regennetwork/Release-process-for-regen-web-3dce8a42813b466fa46d44e8723a3b62?pvs=4#8acaa2cb42e740868083ab24df616be1

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Author Checklist

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I have...

• provided a link to the relevant issue or specification
• provided instructions on how to test
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

How to test

This isn't really testable on deploy previews since they are not using the prod environment variables.

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• confirmed all author checklist items have been addressed
• reviewed code correctness and readability
• verified React components follow DRY principles
• reviewed documentation is accurate
• reviewed tests
• manually tested (if applicable)

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