HTML from nested Folder not working

If we keep any HTML files inside a nested folder, then build is not picking the same. 

For Eg,
```
src
   pages
       page1.html
   index.html
```

then the **only index.html gets copied to dist folder**. While searching this issue, I found this useful link. https://stackoverflow.com/questions/42572806/npm-copyfiles-not-correct-target-path