integration-docs: Remove two outdated macros.

- generate-integration-url.md has been long replaced by the
generate-webhook-url-basic.md.
- webhook-url.md was only being used inside the above macro.

api_docs/incoming-webhooks-walkthrough.md

@@ -444,7 +444,7 @@ Learn how Zulip integrations work with this simple Hello World example!
 
 1. {!create-an-incoming-webhook.md!}
 
-1. {!generate-integration-url.md!}
+1. {!generate-webhook-url-basic.md!}
 
 1.  To trigger a notification using this example webhook, you can use
     `send_webhook_fixture_message` from a [Zulip development

docs/documentation/integrations.md

@@ -132,9 +132,6 @@ Here are a few common macros used to document Zulip's integrations:
   webhooks. For an example rendering, see the last paragraph of **Step 2**
   in [the docs for Zulip's GitHub integration][github-integration].
 
-- `{!webhook-url.md!}` - Used internally by `{!generate-integration-url.md!}`
-  to generate the webhook URL.
-
 - `{!webhook-url-with-bot-email.md!}` - Used in certain non-webhook integrations
   to generate URLs of the form:
 

templates/zerver/integrations/include/generate-integration-url.md

@@ -1,18 +0,0 @@
-[Generate the URL][generate-url] for your {{ integration_display_name }}
-integration.
-
-{% if all_event_types is defined %}
-
-{!event-filtering-instruction.md!}
-
-{% endif %}
-
-The generated URL will look something like this:
-
-{!webhook-url.md!}
-
-*To manually construct the URL for an incoming webhook integration,
-see [the webhook URLs specification][incoming-webhook-urls].*
-
-[generate-url]: /help/generate-integration-url
-[incoming-webhook-urls]: /api/incoming-webhooks-overview#url-specification

templates/zerver/integrations/include/webhook-url.md

@@ -1 +0,0 @@
-`{{ api_url }}{{ integration_url }}?api_key=abcdefgh&stream=123`