VG.com Public pages

It would be nice to have some public pages:

* Search (limited to variants/genes etc)
* variant page
* Gene page

Then disable various related object lookup with:

```
{% if request.user.is_authenticated %}
```

We use ```GlobalLoginRequiredMiddleware``` so would have to add these to ```settings.PUBLIC_PATHS```

Drive via config

Shariant testing would involve making sure these are not visible