Links open in the new tab

[zzzsyyy]

Open the vast majority of non-internal links in a new tab add target = "_blank"

reference ：#6545

[wangchucheng]

Thanks for this PR! Sorry for the late reply because there are many personal affairs after the Chinese New Year.

People have different opinions about when to open a new window, but this is indeed a useful feature in some situations. I think we can make it configurable.