fix(hmr): Make HMR work with Nuxt

[peterbud]

Description

Fixes #528 #445
HMR was not working with Nuxt (Vue3 however was able to do HMR).

I'm not a Vite expert, so any help would be appreciated if I misinterpreted the way how histoire is working.

• Previously even for build command HMR was turned on for client builds. Using the command === 'build' check in build command HMR is turned off
• For dev builds ('serve'), two vite servers are being launched. First the "normal" one and second the "node server" I believe for collecting the stories. However for the node server HMR is disabled. I believe this has disabled/interfered with the HMR of the first vite server. Changing the launch order makes HMR work for Nuxt as well.

Additional context

If there is a better way to achieve the same, let me know.

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