Many of the external links on golang.google.cn are inaccessible from Mainland China (e.g. *.golang.org, *.blogspot.com, *.googlesource.com), which might cause some troubles for Chinese developers.

Directly removing all inaccessible links would lead to situations like: "For more details, please check out this post" (while there isn't a link, nor is it clear which post it is). Instead, we can keep those links and automatically render a tooltip for blacklisted URLs that is shown if you put your mouse over it (a hover overlay, actually already implemented in the DevSite infrastructure. For instance tensorflow.google.cn, put mouse over the Google logo in the company list to test)

The other route we could take is to separate files, like go_faq.zh.html, and let them slowly be translated by the community. It would be nice to have Chinese translations in the future. We'd have to remember to add content to both in the future, though.

See the discussion on https://go-review.googlesource.com/c/go/+/89215 for more context.

/cc @chenglu for checking CN site policies @andybons @bradfitz