🧹 chore: more configurable oauth settings

[garrettladley]

@alderwhiteford, should the redirect uri be hardcoded? what is it in reference to? frontend uri? backend uri?

RedirectURI: "http://localhost:3000",

[garrettladley]

see backend/config/oauth_google.go and backend/config/oauth_outlook.go

[alderwhiteford]

redirectURI is where the user is redirected to on the frontend after authenticating with the oauth client. It should be hardcoded for local and production

[garrettladley]

but the port might not always be 3000? we might set to port 0 to get a dynamic port allocation