Create Login/Signup Modal

[Rl0007]

Currently when you try to login in the UI it redirects you to Frappe's Login Page.

This is bad UX as the user loses context.

To fix this create a "Login/Signup" modal that allows user to do following

1. Login (Password, Gmail, Email Link)
2. Signup (Email, Gmail)
3. Forgot Password (Sends links to user to be able to reset password)

[Rl0007]

#190 implements this