The DAGs main page has All/Active/Paused.

It would be nice if we can have also Running Now which will show all the DAGs that have at least 1 in Running of DAG runs:
![Screen Shot 2021-08-25 at 11 30 55](https://user-images.githubusercontent.com/62940116/130756490-647dc664-7528-4eb7-b4d8-515577f7e6bb.png)


For the above example the new DAGs tab of Running Now should show only 2 rows.
The use case is to see easily what DAGs are currently in progress.

"""Shows configuration."""
        raw = request.args.get("raw") == "true"
        title = "Airflow Configuration"
        expose_config = conf.get("webserver", "expose_config").lower()
        
        if raw:
            if expose_config == "non-sensitive-only":
                from airflow.configuration import SENSITIVE_CONFIG_VALUES
                updater = configupdater.ConfigUpdater()
                updater.read(AIRFLOW_CONFIG)
                for sect, key in SENSITIVE_CONFIG_VALUES:
                    if updater.has_option(sect, key):
                        updater[sect][key].value = "< hidden >"
                config = str(updater)
            elif expose_config in {"true", "t", "1"}:
                with open(AIRFLOW_CONFIG) as file:
                    config = file.read()
            else:
                config = (
                    "# Your Airflow administrator chose not to expose the configuration, "
                    "most likely for security reasons."
                )
            return Response(
                response=config,
                status=200,
                mimetype="application/text",
                headers={"Deprecation": "Endpoint will be removed in Airflow 3.0, use the REST API instead."},
            )
        if expose_config in {"non-sensitive-only", "true", "t", "1"}:
            display_sensitive = expose_config != "non-sensitive-only"