Integrate docs with fly cli

[kcmannem]

Many times when I write pipelines, its quite easy to forget the different keys that take to construct steps in a plan or sometimes you just need an example. The obvious step is to open up the docs site and search for what you're looking for. This is a very slow process.

If we baked in something like a man subcommand for the various steps we can provide a faster experience to look up.

eg.
fly man get
fly man on_abort

or we could try a docs command that will launch the docs page with your search params evaluated.

eg.
fly docs image_resource would open up a new browser tab with a search performed for "image_resource" on concourse-ci.org

[stale]

Beep boop! This issue has been idle for long enough that it's time to check in and see if it's still important.

If it is, what is blocking it? Would anyone be interested in submitting a PR or continuing the discussion to help move things forward?

If no activity is observed within the next week, this issue will be exterminated closed, in accordance with our stale issue process.

[kcmannem]

no I still want this