Link appservice-webhooks to hookshot

with deprecation notice

docs/configuring-playbook-bridge-appservice-webhooks.md

@@ -2,6 +2,8 @@
 
 The playbook can install and configure [matrix-appservice-webhooks](https://github.com/turt2live/matrix-appservice-webhooks) for you.
 
+Note: This bridge is no longer maintained. While not a 1:1 replacement, the bridge's author suggests taking a look at [matrix-hookshot](https://github.com/Half-Shot/matrix-hookshot) as a replacement, which can also be installed using [this playbook](configuring-playbook-bridge-hookshot.md).
+
 This bridge provides support for Slack-compatible webhooks.
 
 Setup Instructions: