Cleanup older testnet docs and update for mainnet mint

[anomit]

This cleans up the documentation of the older Lite node testnet setup instructions.

Checklist

• My branch is up-to-date with upstream/main branch.
• Everything works and tested for major version of Python/NodeJS/Go and above.
• I ran pre-commit checks against my changes.
• I've written tests against my changes and all the current present tests are passing.

Current Behaviour

• Outdated lite node setup instructions that are no longer relevant
• Missing comprehensive Telegram bot setup documentation for node health monitoring
• Unclear instructions for configuring Telegram notifications in node setup

New Expected Behaviour

• Clear, step-by-step guide for setting up Telegram bot monitoring
• Improved documentation for node health tracking via Telegram
• Streamlined node monitoring configuration process

Change Logs

Changed

• Telegram Bot Setup documentation

Removed

• Deprecated lite node setup documentation

Related Components

• Snapshotter Node Monitoring
• Telegram Bot Integration

Deployment Instructions

[chetna-mittal]

LGTM

[Seth-Schmidt]

Looks good.