Mark the starttls module as deprecated.

Author: sadiepowell

docs/3/modules/starttls.yml

@@ -0,0 +1,26 @@
+name: starttls
+
+description: |-
+  This module provides the IRCv3 `tls` client capability.
+
+configuration:
+- name: starttls
+  description: |-
+    The `<starttls>` tag defines settings about how the starttls module should behave. This tag can only be defined once.
+  attributes:
+  - name: provider
+    type: Text
+    required: false
+    default: null
+    description: |-
+      The name of the TLS profile to use for STARTTLS clients.
+  details: ""
+  example: |-
+    ```xml
+    <starttls provider="gnutls">
+    ```
+
+client_caps:
+- name: '[tls](https://ircv3.net/specs/extensions/tls.html)'
+  description: |-
+    Allows plaintext connections to upgrade to TLS.

docs/3/modules/starttls.yml

@@ -1,5 +1,11 @@
 name: starttls
 
+introduction: |-
+  !!! warning ""
+      This module is deprecated and will be removed in the next major version of InspIRCd.
+
+      This capability has been deprecated by IRCv3. It is recommended that you use [the ircv3_sts module](/4/modules/ircv3_sts) instead.
+
 description: |-
   This module provides the IRCv3 `tls` client capability.