docs: simplify command used to populate permission tuturial code

Signed-off-by: MT Lewis <mtlewis@users.noreply.github.com>

docs/permission/plugin-authors/01-setup.md

@@ -20,16 +20,10 @@ The source code is available here:
 1.  Copy-paste the two folders into the plugins folder of your backstage application repository or run the following script from the root of your backstage application:
 
     ```bash
-      $ node -e "const{UrlReaders}=require('@backstage/backend-common');\
-      const{ConfigReader}=require('@backstage/config');\
-      const winston=require('winston');const{outputFile}=require('fs-extra');\
-      const path=require('path');const logger=winston.createLogger({level:'info',});\
-      const config=new ConfigReader({});(async function execute(){\
-      const reader=UrlReaders.default({logger,config});const files=await reader.readTree(\
-      'https://github.com/backstage/backstage/tree/permission-docs\
-      /contrib/plugins');return Promise.all((await files.files()).map(async file=>\
-      file.path!=='README.md'&&outputFile(path.join(__dirname,'plugins',file.path),\
-      await file.content(),),),).catch(console.log)})()"
+    $ curl https://codeload.github.com/backstage/backstage/zip/refs/heads/master | \
+        tar -C plugins --strip-components=1 -xv \
+        backstage-master/contrib/plugins/todo-list \
+        backstage-master/contrib/plugins/todo-list-backend
     ```
 
     Your application structure should look something like this: