Update gas estimation pages

[jlwllmr]

linea_estimateGas is being activated today, September 30. This PR updates the gas estimation guide accordingly and also amends text in a few other places to reflect the endpoint being fully available.

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Name	Status	Preview	Comments	Updated (UTC)
doc-zk-evm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 3, 2024 1:20pm

[bgravenorst]

Some initial feedback:

1. We currently mention, “Linea also supports eth_estimateGas, eth_gasPrice, and eth_feeHistory.” And link out to those methods in the Infura docs. But then we also document those methods in the topic.
I recommend removing the API documentation from this topic and just leaving the links to the content. They are not the recommended methods for estimating gas anyway and we’re mixing reference and how to content.

2. This is a guide (or how to) on how to estimate gas. So we should perhaps have an example of using linea_estimateGas. Perhaps the example in the reference content will suffice. Then, if users want to learn more about the method and it’s parameters they can view the reference content.

3. We currently mention, "linea_estimateGas will be fully activated on Mainnet on September 30." This date has passed so If it hasn't been activated then we should update this.

4. If linea_estimateGas is fully active, then do we still need all the the Compatibility mode documentation?

[jlwllmr]

@bgravenorst thanks for the comments.

1. Yeah, that makes sense. Will adjust.
2. Got it, will add in the example but leave out the details.
3. Agreed, adjusting.
4. I think we need this content for now, potentially for a few weeks. Not all providers will have switched over immediately.