feat: add Ethereum on ARM guide to advanced node setup

[washosk]

1. Added "Ethereum on ARM" Guide: Created a new advanced node setup guide ethereum-on-arm.md for users running the Ethereum on ARM custom Linux image.
2. Comprehensive Instructions: The guide covers:
   • Installing the ls-lido package.
   • Setting up consensus/execution clients with MEV-Boost.
   • Generating Validator Keys (clarifying the 1.5 ETH bond for ICS vs 2.4 ETH for general operators).
   • Importing keys and starting the validator with the specific Lido configuration.
   • Instructions for the Hoodi Testnet (including correct Chain ID and Fee Recipient addresses).
3. Updated Index: Added the new page to the index.md list.

[washosk]

Thanks for the detailed review! I've applied the requested changes in the latest commits:

• Structure & Sidebar: Renamed the section to "Running CSM on Mainnet" and updated sidebar_position to 3. Also bumped the systemd guide to 4 to keep the order correct.
• Content & Terminology: Updated to "CSM validators", cleaned up the requirements (removed bond specifics), and clarified the MEV Boost setup.
• UX Improvements: Implemented Tabs for all client commands (Lighthouse, Prysm, Teku, Nimbus) to align with other docs.
• Links: Replaced manual key generation and activation steps with links to the dedicated guides.

Let me know if there's anything else!

[washosk]

Thanks for the review @dgusakov!
I've updated the guide with the following changes based on your feedback:

• Execution Layer Options: Added Tabs for all available Execution Layer options (Nethermind, Geth, Besu, Reth, Erigon) for both Mainnet and Hoodi Testnet.
• Client Startup Split: Separated the "Start Consensus and Execution Clients" instruction into two distinct steps with individual tabs for clear selection.
• Testnet Consistency: Applied the same Tabs structure to the Testnet section for consistency.

Let me know if there is anything else!

[washosk]

I've updated the guide with the remaining feedback:

• Testnet Section: Added client tabs for consensus clients and included the missing systemctl start validator commands.
• Teku Configuration: Added instructions for using the setup_validator_passwords helper script on both Mainnet and Testnet.
• Lodestar: We have intentionally omitted Lodestar for now as it hasn't been verified in production with this specific setup yet.
  Thanks for the review!

[washosk]

I've just pushed one more minor update:

• Removed an incorrect top-level bash wrapper in the Teku tab that was causing rendering issues with nested code blocks.
• Standardized the indentation in the Testnet section to resolve linting warnings and ensure consistency.
• Confirmed that the documentation builds correctly via npm start.

[TheDZhon]

GG

[dgusakov]

@washosk Pls fix the broken link

[TheDZhon]

Godspeed!