feat: enhance subscription page configuration documentation

docusaurus.config.ts

@@ -18,15 +18,19 @@ const config: Config = {
         defaultLocale: 'en',
         locales: ['en']
     },
+    markdown: {
+        mermaid: true
+    },
+    themes: ['@docusaurus/theme-mermaid'],
 
     headTags: [
         {
             tagName: 'meta',
             attributes: {
                 name: 'theme-color',
-                content: '#242c38',
-            },
-        },
+                content: '#242c38'
+            }
+        }
     ],
 
     presets: [