feat(svelte,docs): add SvelteKit adapter & example

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Closes #383

Add a new @lagon/sveltekit adapter with an example SvelteKit app (Sverdle)

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🦋 Changeset detected

Latest commit: 74111ae6f6aabdd568f72737ad1a34e06a6bae37

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | ------------------------ | ----- | | @lagon/docs | Patch | | @lagon/sveltekit | Patch | | @lagon/example-sveltekit | Patch |

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4 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **dashboard** | ⬜️ Ignored ([Inspect](https://vercel.com/lagon/dashboard/39Y1GhKJDMpSK1UE4ufatEeWFmrZ)) | [Visit Preview](https://dashboard-git-feat-svelkit-adapter-lagon.vercel.app) | | Jun 29, 2023 4:55pm | | **docs** | ⬜️ Ignored ([Inspect](https://vercel.com/lagon/docs/8jeTf9Qcxyb831DJcGt7Bij2NE2z)) | [Visit Preview](https://docs-git-feat-svelkit-adapter-lagon.vercel.app) | | Jun 29, 2023 4:55pm | | **storybook** | ⬜️ Ignored ([Inspect](https://vercel.com/lagon/storybook/7UWMnHcQcSf7q91ss4nV4gvLY3dm)) | [Visit Preview](https://storybook-git-feat-svelkit-adapter-lagon.vercel.app) | | Jun 29, 2023 4:55pm | | **www** | ⬜️ Ignored ([Inspect](https://vercel.com/lagon/www/8wy1MshTPqViwRW6XNTZsLeb3mN6)) | [Visit Preview](https://www-git-feat-svelkit-adapter-lagon.vercel.app) | | Jun 29, 2023 4:55pm |