Fix/zkevm kyoto

[mc2eqe]

This is documentation for RPC setup that our partners use to setup zKoyto RPC. This is a change from zKatana to zKyoto. Updated also install procedure: now it is more simpler and similar to mainnet setup.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 99d5f01):

https://astar-docs--pr653-fix-zkevm-kyoto-pfpgixtz.web.app

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