Add support for Visual Editing.

[daveli]

👋 This PR upgrades the template to Astro 4 and Sanity 3.46 with support for visual editing.

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Name	Status	Preview	Comments	Updated (UTC)
template-astro-clean	❌ Failed (Inspect)			Jun 28, 2024 7:36am

[christianhg]

Hi @daveli ! Thanks a lot for this!

The PR was a bit much to take in (too many unrelated changes at once) so I decided to upgrade the relevant dependencies in #34

I took the liberty to rebase your branch to resolve the resulting merge conflicts caused by merging #34 – I hope that's alright with you.

Now, your PR is more focused on adding Visual Editing support to the template, which is great! Could you help me out and remove the rest of the unrelated changes? For dependencies, we probably just need to add @sanity/visual-editing by now and not pin or downgrade other dependencies. Also, I'm unsure the change to the node version strictly relevant to this PR.

Thanks!

[daveli]

👋 I have updated the PR to only include the changes to support Visual Editing. I will create a different PR to address the loading of environment variables once this one is merged 😎