docs(extensions): update latest extensions documentation (#2320)

config/edit-page-config.json

@@ -1,18 +1,22 @@
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-        "value": "/tools/generator",
-        "href": "https://github.com/asyncapi/generator/tree/master/docs"
-    },
-    {
-        "value": "reference/specification/",
-        "href": "https://github.com/asyncapi/spec/blob/master/spec/asyncapi.md"
-    },
-    {
-        "value":"/tools/cli",
-        "href":"https://github.com/asyncapi/cli/tree/master/docs"
-    },
-    {
-        "value": "",
-        "href": "https://github.com/asyncapi/website/blob/master/pages"
-    }
-]
+  {
+    "value": "/tools/generator",
+    "href": "https://github.com/asyncapi/generator/tree/master/docs"
+  },
+  {
+    "value": "reference/specification/",
+    "href": "https://github.com/asyncapi/spec/blob/master/spec/asyncapi.md"
+  },
+  {
+    "value": "/tools/cli",
+    "href": "https://github.com/asyncapi/cli/tree/master/docs"
+  },
+  {
+    "value": "",
+    "href": "https://github.com/asyncapi/website/blob/master/pages"
+  },
+  {
+    "value": "reference/extensions/",
+    "href": "https://github.com/asyncapi/extensions-catalog/tree/master/extensions"
+  }
+]

pages/docs/reference/extensions/_section.md

@@ -0,0 +1,4 @@
+---
+title: Extensions
+weight: 10
+---

pages/docs/reference/extensions/x.md

@@ -0,0 +1,31 @@
+---
+title: 'x' 
+weight: 11
+---
+
+# Twitter Extension
+This document defines how to use `twitter` extension in AsyncAPI documents.
+
+## Overview 
+This extension allows you to provide the Twitter username of the account representing the team/company of the API.
+
+## Extension Definition
+
+### Type: String
+
+Name of the Twitter username.
+
+## Extension Location 
+
+This extension can be used in the following locations:
+- [Info Object](https://www.asyncapi.com/docs/reference/specification/v2.6.0#infoObject)
+
+## Example
+
+```yaml
+asyncapi: '2.6.0'
+info
+  title: Strretlights Kafka API
+  version: '1.0.0'
+  x-twitter: StreetLightData
+```