Reorganize documentation sidebar positions and update HAProxy stats configuration

- Updated sidebar positions across multiple documentation files for improved navigation and logical grouping.
- Revised HAProxy stats configuration to require `HAPROXY_PASSWORD` for enabling statistics.
- Clarified environment variable descriptions and usage in `environment-variable.md`.

docs/Plugins/cleanup.md

@@ -1,5 +1,5 @@
 ---
-sidebar_position: 6
+sidebar_position: 21
 ---
 
 # Cleanup Plugin

docs/Plugins/cloudflare.md

@@ -1,5 +1,5 @@
 ---
-sidebar_position: 5
+sidebar_position: 18
 ---
 
 # Cloudflare Plugin

docs/Plugins/deny-pages.md

@@ -1,5 +1,5 @@
 ---
-sidebar_position: 4
+sidebar_position: 20
 ---
 
 # Deny Pages Plugin

docs/Plugins/fastcgi.md

@@ -1,5 +1,5 @@
 ---
-sidebar_position: 1
+sidebar_position: 17
 ---
 
 # FastCGI Plugin
@@ -174,4 +174,4 @@ The plugin configures:
 ## Related Documentation
 
 - [Plugin System Overview](../plugins.md)
-- [Container Labels Reference](../container-labels.md)
+- [Container Labels Reference](../container-labels.md)

docs/Plugins/ip-whitelist.md

@@ -1,5 +1,5 @@
 ---
-sidebar_position: 3
+sidebar_position: 19
 ---
 
 # IP Whitelist Plugin

docs/Plugins/jwt-validator.md

@@ -1,5 +1,5 @@
 ---
-sidebar_position: 2
+sidebar_position: 16
 ---
 
 # JWT Validator Plugin