markdown-include is GPL licensed.
Also, rewrite it as a block processor, so that it works correctly
inside indented blocks.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
We ask our users to enable Snapshot notifications in Zulip via
Slack! But our Slack integration isn't exactly super robust and
I checked and our librato implementation isn't super smart about
handling snapshot payloads that come in via Slack.
Overall, this seems like a very poor solution, asking the user
to set up Slack in order to get the notifications in Zulip. So, I
thought we should get rid of at least the docs that suggest doing
this.
I also read librato/view.py and it wasn't clear to me how Slack
is supposed to act as an intermediate service here in a reliable
manner, which is another reason to not advertise this.