[Bug]: Some issues related to the serverGen in VSCode

[lirenhe]

Describe the bug

• While config server emitters in vscode, the default emitter-output-dir is different from client emitter. Is this expected?

  "@typespec/http-server-csharp":
    emitter-output-dir: "{output-dir}/{emitter-name}"
  "@typespec/http-server-js":
    emitter-output-dir: "{output-dir}/{emitter-name}"

• The folder structure with the above setting doesn't look right as there are a couple of cs files in the root folder
  I expect all items related to .net will be under http-server-csharp folder
  

• The readme.md file that talked about the next step is a bit confusing. Shall we ask user to run C# scaffolding commands to generate some runnable code so that user could start the server?

• I have no idea what I shall do with the generated JS server code? Seems there is no document or link that tells me the next step.

Reproduction

1. In vscode, invoke the command of TypeSpec: emit from TypeSpec
2. select .NET server and JS server code emitter.
3. run the emitter.

Checklist

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• The provided reproduction is a minimal reproducible example of the bug.