Upgrade to svelte 4

[ghost]

I upgraded to svelte 4 my project and I have seen that layercake requires svelte 3.

I tried to update your github repo by doing:

pnpm up --latest
pnpm remove eslint-plugin-svelte3
pnpm i eslint-plugin-svelte

After a ´pnpm build´ there are a lot of git changes in the docs folder. I'm not sure on how your repo is set up but probably those files are generated by svelte and now they look different because of svelte 4.

I have a fork here without the changes from pnpm build
https://github.com/MCMattia/layercake

[mhkeller]

Yea the docs folder is compiled so I imagine the code will be different. I'll have to go through and make sure there are no breaking changes before putting out a release

[mhkeller]

This is pretty much done. Just want to coordinate the publish date with another project.