Small improvement to the example bookmarklet
The bookmarklet in the [wiki](https://github.com/zedeus/nitter/wiki/Extensions#bookmarklet-by-mennaruuk) breaks on mobile URLs. Changing `'twitter.com'` to `/(mobile.)?twitter.com/` works. 

It's not exhaustive like the regex discussed in https://github.com/zedeus/nitter/issues/304#issuecomment-1001885105, but I think it's good enough for the bookmarklet.


