Add Option to Not Prompt for Authentication on Startup

**Is your feature request related to a problem? Please describe.**


I don't want to sign in to my GitHub account, but every time I open VSCode with this plugin installed I'm prompted by this notification to sign in. There doesn't appear to be any way to say "Don't remind me again"

**Describe the solution you'd like**

Some way to say that I don't want to be prompted to sign in with my github account every time I open VSCode.