refactor: improve zk stack block explorer guide pt1

[zk-Lumi]

What 💻

• Remade guide for using block explorer
• Removed inaccurate wording for using block explorer
• Improved wording for using block explorer
• Split block explorer part into 2 sections -> 1) via docker 2) locally

Why ✋

• Part of the guide was inaccurate
• Also this section was quite confusing on how to use block explorer

[github-actions]

Visit the preview URL for this PR (updated for commit f4a2e43):

https://staging-zksync-web-era-docs--pr949-zk-lumi-patch-1-1mmm0bpw.web.app

_{(expires Wed, 13 Mar 2024 07:14:57 GMT)}

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[zk-Lumi]

Part 1 (this PR) - This is to update the section on block explorer running locally, wording, and to remove inaccurate description.

Part 2 (next PR) - @githubdoramon will help update the section on block explorer running in docker in coming days.

[githubdoramon]

Requesting some small changed

[github-actions]

🎉 This PR is included in version 1.34.0 🎉

The release is available on GitHub release

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