Athens: Integrate with pkg.go.dev

[marwan-at-work]

Now that pkg.go.dev will be open sourced (more here https://groups.google.com/forum/#!msg/golang-dev/mfiPCtJ1BGU/OZ9cU3SgBgAJ)

This is a place holder ticket to see if/how we can integrate Athens with it :v:

[arschles]

One idea - we could add it to some of our deployment artifacts. For example, you could install the helm chart and it would optionally have a doc server all set up alongside your Athens server.

Obviously depends on if the server is easily packaged up in an image and easily deployed

[twexler]

This feels a bit out of scope for Athens, but could be part of a larger initiative to provide non-Google-hosted Go development resources

[arschles]

Agreed. If pkg.go.dev is like moddoc, you would be able to point it at Athens and it would "just work".

If that is not the case, I hope there would be a way we can make them work together. I would advocate we build the software to do that in a different repo. Or at least in a different binary.

[twexler]

I wasn't familiar with moddoc, nice work @marwan-at-work!

That would be the most ideal. It's a bit disappointing go doc's http server was deprecated, as having access to the on-disk cache that Athens uses could also be a great excuse to run a docs server with it.