Update part12c.md

[ziirou]

Added a fix for wget connecting problem.

I was stuck with this for quite long and it seemed that others have had similar problems (in Discord channel).

[ziirou]

Found this too from the Discord channel: vitejs/vite@bd896fb
So the allowedHosts has been added to server options for Vite v7.1.4.

[WingRa7]

Came across the same problem too.

I'm thinking if we could use host:true to avoid having to then use the --host flag, and the pros/cons of using allowedHosts: true vs ['app'].

  server: {
    host: true,
    allowedHosts: true,
  },
  ``