Clean up and simplify the "Running a Chainlink Node" page.

[dwightjl]

View staged changes here: https://deploy-preview-192--dreamy-villani-0e9e5c.netlify.app/docs/running-a-chainlink-node

• Fix a broken docker inspect --format example. The format contents disappeared because they were in {{ }} brackets, which Liquid interpets as Liquid tags even within markdown codeblocks. See the currently published example: https://docs.chain.link/docs/running-a-chainlink-node/#ethereum-client-on-the-same-machine
• Simplify the "Set your Ethereum Client URL" process to require fewer steps and reference fewer other sections in the document, which consolidates the steps in one section.
• Rewrite the requirements section and include network requirements that were previously documented in a callout box.
• Remove environment variable steps and ask the user to edit the .env variables directly. This reduces the complexity of the process but shifts more work to the user.
• Clean up several formatting mistakes.
• Correct errors in dependency guides for running external DBs and ETH clients.

[dwightjl]

I restored the Docker recommendation section. Previously I had moved it to the Requirements section because it seemed redundant with the Docker-CE requirement, but if you want the Docker requirement to be more prominent we can keep the full Docker section.

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[dwightjl]

These fixes are still relevant. Re-synced and ready to merge.

[dwightjl]

Updated to track the latest changes in main. See the PR description for the current list of changes.

[PatrickAlphaC]

Can we just have "running from docker" be above "running from source"? And then make it clear that the rest of the doc is going to be running from docker.

[PatrickAlphaC]

https://deploy-preview-192--dreamy-villani-0e9e5c.netlify.app/docs/running-a-chainlink-node/#create-an-environment-file

This section is still confusing to me.

Can we have sections for adding the 2 variables:

ETH_URL=ws://[CONTAINER_IP]:[CONTAINER_PORT]
DATABASE_URL=postgresql://[DB_USER]:[DB_PW]@[DB_IP]:[DB_PORT]/[DB_NAME]?sslmode=[SSL_MODE]

Like we had before? Like something like "now add your ETH_URL, you can do it one of 3 ways. If you're runing your own, do it like ws://[CONTAINER_IP]:[CONTAINER_PORT], if you're using an external URL, do it like this: ...."

Does that make sense?

[PatrickAlphaC]

For Start the Chainlink Node, we should tell them that a decent version is 0.10.10

[dwightjl]

@PatrickAlphaC I rewrote significant parts of the document and split up the ETH client steps from the DB config steps. I also added 0.10.10 as a recommended version.

The whole document has significant changes since you last reviewed, and some additional pages are also changed.

[PatrickAlphaC]

Sorry, going to need another day or 2 to review.

[PatrickAlphaC]

Could we add something in here about using an external service for the ETH_URL? That still seems lacking to me. During the Set the Ethereum Client URL and Port. I think ideally there is a part that's like "If you're using an external service, just add the websocket URL in the .env like so:"

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Name	Status	Preview	Updated
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