Updates text of generate-webhook-url-basic.md to replace the use of
the "Create the channel" step.
Removes {!create-channel.md!} from all the integrations docs that
also include {!generate-webhook-url-basic.md!}.
Fixes#32269.
Using an if block when {!event-filtering-additional-feature.md!}
is used implied that we plan to have this in all webhook doc .md
files.
But, it actually makes sense to only use this macro when the
webhook integration actually supports event filtering.
Updates `git-webhook-url-with-branches.md` (and two files that use
that file as an include link) for some of the follow-ups from #22315
to the Markdown parser. With this fix, all integrations docs that
reference this file as an include link should render the url as a
div element with `.codehilite` class.
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>
