Prepare package for v1 + Svelte 5 readiness

[theetrain]

Before publishing v1 package:

• Set svelte version in package.json peerDependencies to ^3.55.1 || ^4.0.0 || ^5.0.0
• Ensure 'getting started' documentation is up-to-date
• Documentation related to styling is up-to-date

[theetrain]

I tried installing and testing svelte@5.0.0-next.115.

Test branch: https://github.com/carbon-design-system/carbon-components-svelte/tree/chore/svelte-5-test
Changes made: bd3ea6d

• Switched fully to ESM
• Removed format compiler option

I ran the docs: cd docs && yarn dev, but then ran into this runtime error:

Uncaught TypeError: Cannot read properties of undefined (reading 'call')

Which points to this presumably svelte-generated code:

function clone_node(node, deep) {
  return (
    /** @type {N} */
    clone_node_method.call(node, deep)
//  ^ this is `undefined`
  );
}

Going to try coming back to this later and find out why this happens.