jobs/swh-docs: Turn dev builds more verbose to help debugging
In order to quickly debug failed builds of swh-docs, make the output of the development builds a little bit more verbose and dump sphinx traceback to stdout when an error occcurs.
Staging instance, all changes can be removed at any time
In order to quickly debug failed builds of swh-docs, make the output of the development builds a little bit more verbose and dump sphinx traceback to stdout when an error occcurs.