chore: refactor layout (#1888)

Refactor layouts for unified version handling

pt-br/3x/api.md

@@ -1,7 +1,7 @@
 ---
-layout: 3x-api
+layout: api
+version: 3x
 title: Express 3.x - API Reference
-menu: api
 lang: pt-br
 description: Access the API reference for Express.js version 3.x, noting that this
   version is end-of-life and no longer maintained - includes details on modules and

pt-br/4x/api.md

@@ -1,7 +1,7 @@
 ---
-layout: 4x-api
+layout: api
+version: 4x
 title: Express 4.x - Referência da API
-menu: api
 lang: pt-br
 description: Access the API reference for Express.js 4.x, detailing all modules, methods,
   and properties for building web applications with this version.

pt-br/5x/api.md

@@ -1,7 +1,7 @@
 ---
-layout: 5x-api
+layout: api
+version: 5x
 title: Express 5.x - Referência da API
-menu: api
 lang: pt-br
 description: Access the API reference for Express.js 5.x, detailing all modules, methods,
   and properties for building web applications with this latest version.

pt-br/api.md

@@ -1,5 +1,6 @@
 ---
-layout: 4x-api
+layout: api
+version: 4x
 title: Express 4.x - Referência de API
 lang: pt-br
 description: Access the API reference for Express.js detailing all modules, methods,