This adds GitHub login via Firebase, as a foundation for adding a gallery (#26). Currently it just adds a login/logout button to the Debug page.
At an architectural level, this adds an AuthContext React context, whose interface is generic enough that it's not coupled to Firebase or GitHub. In fact, the default context is a "null context" whose operations are all no-ops.
This adds GitHub login via Firebase, as a foundation for adding a gallery (#26). Currently it just adds a login/logout button to the Debug page.
At an architectural level, this adds an
AuthContextReact context, whose interface is generic enough that it's not coupled to Firebase or GitHub. In fact, the default context is a "null context" whose operations are all no-ops.