Added support for creating new software container from Binder-compatible Git repositories. Minor code refactoring.

The registry is now exposed by the proxy server under SSL. Adapted the docker-compose-dev.yml file and the standaloneworker accordingly.

Added the DISABLE_LOCAL_AUTH conf to the README and fixed an inconsistent behaviour in the login page.

Added the standalone computing resource service with Podman, Docker and Singularity support. Improved demo slurm cluster naming.

Added support for setting container runtimes on a per-task basis in the computing options. Minor improvements in the UX.