Start on startup is enabled with no way to disable it until logging in

[5HT2]

This report is from windows but it likely affects other platforms as well.

Once you install the revolt desktop app, it registers itself as a startup app, with no way to disable it until you make an account and login.

A few suggestions

• Don't enable start on startup until the user logs in (probably just ask if they want it to? having things just start on startup without asking is intrusive and is something that should be off by default)
• Make client settings accessible from the startup page before logging in

[insertish]

Implementation blocked on https://github.com/revoltchat/frontend/issues/14