[FEATURE REQUEST] : add flags for blocks extra contents (porn, social networks , etc.)

[thealio]

Hi, in my opinion , it could be great to have flags for generate an hostfile that block extra content , like porn-websites , social network etc. , as Steve Blake does in his hostfiles ( https://github.com/StevenBlack/hosts ) As example hblock --porn --> generate the default hblock host file with extra blocking for porn sites hblock --social --> generate the default hblock host file with extra blocking for social networks

with flags that can be combined ( hblock --porn --social )

[hectorm]

I'm sorry, but I think classifying sources is outside the scope of this project.