Preserve query parameters

Currently, if these are the redirects:

```
    - redirects:
        redirect_maps:
            index.md: home.md
```

then a link to `mydomain.com/index.html?q=example` will redirect to `mydomain.com/home.html`.

I would want it to preserve the query parameters, and redirect to `mydomain.com/home.html?q=example`.