feat: Add L2scan to chain explorers

[admin-unifra]

Add L2scan (Arb One) explorer to the chain explorers page.

[cla-bot]

We require contributors to sign our Contributor License Agreement. In order for us to review and merge your code, please sign the linked documents below to get yourself added. https://na3.docusign.net/Member/PowerFormSigning.aspx?PowerFormId=b15c81cc-b5ea-42a6-9107-3992526f2898&env=na3&acct=6e152afc-6284-44af-a4c1-d8ef291db402&v=2

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
arbitrum-docs	✅ Ready (Inspect)	Visit Preview	Nov 26, 2024 3:47am

[admin-unifra]

@anegg0 pls review again. We have signed the CLA.

[hkalodner]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[admin-unifra]

@hkalodner please review

[anegg0]

LGTM

[anegg0]

Hi @admin-unifra, and apologies for the slow processing. Can you please update your fork and push to this PR?
We'll be able to merge, then.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[admin-unifra]

updated.

[atimark]

0x88197EaCf7545B2686715FbBE3DBb0ec725A8514