Support starting Coder Desktop on boot

[ethanndickson]

Whilst #55 describes starting Coder Connect when the app opens, it'd be nice if there was an option to have the app open when booting into Windows.

[EdwardAngert]

moving to docs blocked for now - it'll be nice to have the option in the app itself, and short of that, we can probably give folks a quick how to diy on windows