docs: update celery docs

docs: update SSH documentation

core: use common bootstrap for pyramid app

ssh: allow customizing the base_url for running application. Allows proper URLs inside events when executing on SSH calls.

ssh-support: enabled full handling of all backends via SSH. - run callback deamons - run proper authentication checks - add relative loging. - fixes #5312

ssh-support: don't use API calls to fetch the data. We now rely on pure bootstrap executable that has access to the database and can check things directly without any API calls.

config: remove obsolete debugtoolbar from pylons.

audit-logger: use raw JSON with empty data to control unicode decode warnings. Passing in empty dict triggers warnings on sqlalchemy level that we're trying to pass in NON unicode into Unicode column.

exceptions: improve handling of exception that are unhandled. - inject traceback information into unhandled exceptions.

comments: escape file-paths on commenting to prevent html breakage