Login scene for browser backend
For the browser (standalone) backend, we need a login scene. It needs:
- The Aug[m]entile artwork in the corner
- A headline "Login using your Matrix ID"
- An input form with input fields for username and password
- An optional input field (hidden by default, with an arrow to show it or something) to change the home server, defaulting to matrix.org)
- A login button
The login button can, for now, be made to switch to an empty scene for testing purposes.