fix: config dev port (fix #317)

[hugoattal]

Description

Dev port was always 6006 when not defined in the command line

Additional context

Example histoire config:

// vite.config.js
/// <reference types="histoire" />

import { defineConfig } from 'vite'

export default defineConfig({
  // ...
  histoire: {
    vite: {
      server: {
        port: 1980,
      },
    },
  },
})

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[Akryum]

What happens when we don't configure the port in histoire config? Will it be the normal vite port? I'd prefer it to be 6006 by default unless explicitly set in histoireConfig.vite.server.port.

[hugoattal]

Hum, I see... I updated the fix so that the port configured in the vite config file is overridden with 6006.