docs: add vue vapor repo link

[xiaodong2008]

Change

- However, we are also exploring a new Solid-inspired compilation strategy (Vapor Mode) that does not rely on Virtual DOM and takes more advantage of Vue's built-in reactivity system.
+ However, we are also exploring a [new Solid-inspired compilation strategy](https://github.com/vuejs/core-vapor) (Vapor Mode) that does not rely on Virtual DOM and takes more advantage of Vue's built-in reactivity system.

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[bencodezen]

Thanks for the PR! Good idea to add the link to the guide.