docs: add additional redirect path for WebAssembly introduction

docusaurus.config.js

@@ -97,7 +97,7 @@ const config = {
       {
         redirects: [
           {
-            from: ['/webassembly/introduction'], // Old paths
+            from: ['/webassembly/introduction', '/wasm'], // Matched paths can be a string or a string array.
             to: '/webassembly', // Target path
           },
         ],