[docs] Source code viewer for examples

[rgossiaux]

The examples on each page should have an option to view source.

I probably want to remove the lang="ts" from the example sources and consider converting them away from Tailwind.

[PatWie]

Hi,

nice library. I am curious how you would solve the issue of adding the demo source code in the docs automatically. I currently need to run another script copying files such that each example has the source code below, eg.

https://svelte-konvajs.patwie.com/examples/shapes/line-blob