Use Island based hydration

[KnorpelSenf]

VuePress generates largely static content with a few bits and pieces of dynamic content here and there. However, when hydrating the page, the entire DOM must be rendered again client-side. This has a few disadvantages:

• a lot of superfluous JS is downloaded
• a lot of superfluous JS is executed client-side

Hence, it would make sense to only hydrate the parts of the page that are interactive. Islands Architecture jumps to mind.

This could improve page load speeds drastically.

A related project that uses Vue and partial hydration can be found here: https://github.com/ElMassimo/iles

Please let me know what you think about this, especially regarding required effort/feasibility/utility.