* add a job report to the scenario overview with details and time data

* create Report data class

This change updates the web runner to not require direct database access
for scheduling simulation jobs. Instead, the runner polls the public
REST API for available jobs and reports its results through there.

This change updates the project structure to become flattened.
Previously, the simulator, frontend and API each lived into their own
directory.

With this change, all modules of the project live in the top-level
directory of the repository. This should improve discoverability of
modules of the project.