feat: Add internal stats page for shortcode usage (#1328)

Author: nginx-jack

content/stats.md

@@ -0,0 +1,17 @@
+---
+title: Shortcode report
+description: Shortcode report
+nd-content-type: reference
+toc: true
+---
+
+This page contains usage information for shortcodes.
+
+## Include
+{{< shortcode-usage name="include" >}}
+
+## Call Out
+{{< shortcode-usage name="call-out" >}}
+
+## Tab Group
+{{< shortcode-usage name="tabs" >}}

documentation/include-files.md

@@ -31,13 +31,16 @@ To make sure includes are effective and easy to maintain, follow these guideline
 
 ## Include file index
 
-To aid in discoverability of include files, this index is maintained to offer contributors a reference for existing entries.
+To aid in discoverability of include files, see the [include section](https://docs.nginx.com/stats#include) of our [shortcode report page](https://docs.nginx.com/stats).
+This page is updated as part of every documentation build.
 
 When viewing an include file, you may also see the `files`: parameter in the frontmatter, which shows where the file is currently in use.
 
+Examples of commonly used includes:
+
 | **_File name_** | **_Description_** |
 | ----------------| ------------------ |
 | [_licensing-and-reporting/download-jwt-from-myf5.md_](/content/includes/licensing-and-reporting/download-jwt-from-myf5.md) | Instructions for downloading a JSON Web Token from MyF5 |
 | [_licensing-and-reporting/download-certificates-from-myf5.md_](/content/includes/licensing-and-reporting/download-certificates-from-myf5.md) | Instructions for downloading certificate files from MyF5 |
 | [_use-cases/credential-download-instructions.md_](/content/includes/use-cases/credential-download-instructions.md) | Parallel tabbed instructions for downloading credential files from MyF5 |
-| [_use-cases/docker-registry-instructions.md_](/content/includes/use-cases/docker-registry-instructions.md) | Parallel tabbed instructions for listing Docker images from the F5 Registry |
+| [_use-cases/docker-registry-instructions.md_](/content/includes/use-cases/docker-registry-instructions.md) | Parallel tabbed instructions for listing Docker images from the F5 Registry |