Some adaptations were missed durin recent `swh-web` refactoring
to ensure the webapp can still be executed in docker enviroment,
see commit log below:
```
settings/production: Remove login/logout URL settings
It should have been removed in 104f3b79bf3a as these settings are now
handled in swh.web.settings.common.
This fixes webapp execution in docker environment.
```
```
webapp/urls: Restore exception handling when fetching history counters
This fixes an issue when executing the webapp in docker environment as
such file is not available here.
```