MAINT: Update GHA and test preview mechanism

[mmcky]

This PR

• updates workflow versions
• tests preview and netlify setup

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[mmcky]

@HumphreyYang just checking you don't need _config.ymla do you? I have removed it in 00c8bfa

[HumphreyYang]

@HumphreyYang just checking you don't need _config.ymla do you? I have removed it in 00c8bfa

Many thanks @mmcky. No, we don’t need it.

Please be aware that the lecture on AR(1) processes might be moved to the intro series. Let’s publish this lecture after I hear back from John : )

[mmcky]

Many thanks @mmcky. No, we don’t need it.

👍

@HumphreyYang I am just getting all the infrastructure setup and tested.
I won't be setting up the url structure until the last step.

[HumphreyYang]

@HumphreyYang I am just getting all the infrastructure setup and tested. I won't be setting up the url structure until the last step.

Many thanks @mmcky, roger that.

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