feat: add zksync-cli docs

[itsacoyote]

What 💻

• update the docs with Block Explorer page
  • condensed the block explorers pages into one
• Update the docs with tooling/zksync-cli docs
  • Reformatted the content
• Shifted the API Reference docs in the navigation
• Removed noreferrer from external link component.
  • primarily for analytics purposes. I don't think it hurts to remove it, and makes it easier to track incoming for analytics.
• Added vscode snippets file for reusable snippets.

Why ✋

• Easier to read and navigate zksync-cli commands via the navigation

[itsacoyote]

We have this comment that links to the zksync.io explore page with the list of Explorers, yet we also have this list below of explorers and sorta not explorer with NFTScan.

Is there a reason we have these two lists? We should make one the true list for explorers.

[dutterbutter]

Yeah reviewing zksync.io explore tab, its a lot of the same items we are surfacing here as well. I would rather see what we put together more enticing and better laid out.

[github-actions]

Visit the preview URL for this PR (updated for commit 7474d18):

https://zksync-docs-staging-5eb09--pr13-sf-zksync-cli-docs-lky0itva.web.app

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