fix(cli/tools): correct deno init --serve template behavior

[cotyhamilton]

fix #25305

• adds static folder and asset
• makes the static server test in the template more meaningful
• reorders args in help message
• fixes output to conform to default deno fmt

[CLAassistant]

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[cotyhamilton]

I would have liked to have used fsRoot along with urlRoot in the ServeDirOptions to show them off but the rust tests complained that fsRoot option didn't exist 🤷‍♀️ I think maybe the version of std lib isn't all the way up to date

{
  pattern: new URLPattern({ pathname: "/static/*" }),
  handler: (req) => serveDir(req, { fsRoot: "static", urlRoot: "static" }),
},

[iuioiua]

Great! Thank you.