Use stackoverflow config for stackexchange

[techexo]

Hello everyone,
I don't want to do a PR on this as it is something of a personal taste, but I think the site config for stackoverflow.com (link) should maybe be copied for .stackexchange.com (link) as the websites share the same engine, and the last site config is in my opinion sub-optimal.

[j0k3r]

@fivefilters maybe we should use the fingerprints method for all stackexchange website?

[schuettec]

Are there any plans to support stackoverflow.com?

To be honest I got hopes that https://github.com/wallabag/wallabag supports Stackoverflow in the future. As far as I know wallabag relies on this project.