Update Jest examples and docs

[delbaoliveira]

This PR updates the with-jest example to use the new built-in configuration with SWC. It also creates a new with-jest-babel with the recommended configuration for those who opt-out of SWC.

Docs have also been updated to include both examples.

Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
• Related issues linked using fixes #number
• Integration tests added
• Documentation added
• Telemetry added. In case of a feature if it's used or not.
• Errors have helpful link attached, see contributing.md

Documentation / Examples

• Make sure the linting passes by running yarn lint

[molebox]

I wonder if I'm being pedantic here, what are your thoughts on converting this into steps, using the same heading titles?

[delbaoliveira]

Could you expand on what you mean here? 😊

[molebox]

Sorry. I just mean, would It be clearer for us to explain the QuickStart as a set of steps:

## Step 1: install

## Step2: do something else

This may not be the case here. I don't have a hard and fast rule on this, I just think it makes skimming content easier, you can drop in a a step if need etc.. I don't think this fits in all cases, was wondering what your thoughts are with this section.

I quite like how you have done it tbh, just raising the question. ☺️

[delbaoliveira]

Ah, thank you! I agree with you, it's good to give people context at the start. As you said, I'm not sure how the steps would fit this case, but I've added a quick summary here. wdyt?

[leerob]

Nice work! @molebox has one outstanding comment, but I think you've addressed it 🙏

[molebox]

LGTM