Add example of using bookshop in Sveltekit lib folder to documentation

[silveltman]

I was under the impression that the component-library should be a seperate folder, but I found out by trying that it can also simply be used in the lib folder.

lib/
├─ bookshop/
│  └─ bookshop.config.cjs
├─ components/
│  └─ sample/
│     ├─ sample.bookshop.yml
│     └─ sample. Svelte

Is there something I'm missing why this is not recommended? If not, I think it would be a good idea to add an example of this possibility to the documentation.