Put the setLanguageConfiguration code in the appropriate place

Currently main.ts is mostly populated with this mystifying code blob:
https://github.com/PowerShell/vscode-powershell/blob/6c96a2d56b9593a25e6960df2c6f3767b3d30177/src/main.ts#L53-L104

It seems to have some PowerShell related bits in it, but also some JS doc comment stuff...

It probably shouldn't be in main.ts, and we should work out if it even causes anything. I suspect it's getting ignored in favour of the code in https://github.com/Microsoft/vscode/blob/master/extensions/powershell/language-configuration.json.

We should investigate and:

• if the code here is being preferred, move it to a more sensible location in the repo and make sure it's up to do
• if the VSCode JSON is being preferred, delete this code

Inizia con il codice setLanguageConfiguration in src/main.ts alle righe collegate, quindi confrontalo con il file language-configuration.json di VS Code a cui si fa riferimento nell'issue. Determina quale configurazione viene utilizzata e se il codice TypeScript ha effetto. L'attività è completata quando il codice viene spostato e aggiornato in una posizione più adatta, oppure rimosso se si preferisce il JSON.