Restore browser-extension-template recommendation

### MDN URL

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Build_a_cross_browser_extension

### What specific section or headline is this issue about?

Conclusion

### What information was incorrect, unhelpful, or incomplete?

When the page is converted to describing development of cross browser extensions for MV3, determine whether the recommendation to use [browser-extension-template](https://github.com/fregante/browser-extension-template) can be restored.

### What did you expect to see?

A recommendation for [browser-extension-template](https://github.com/fregante/browser-extension-template), if appropriate

### Do you have any supporting links, references, or citations?

_No response_

### Do you have anything more you want to share?

_No response_