Re-enable front-page advisor

[Mierdin]

In #60 I commented out the front-page advisor component, since it doesn't currently work. This gives a pretty bad first impression to new users, so I'd rather they not see it until it works properly.

#28 highlights that this component uses a very old version of the antidote.js script via a commit ID in antidote-web, and it's possible that in solving that issue, this may be solved as well.

There have been CORS issues for a long time. On chrome in incognito, it seems this was intermittent originally. However, in FF these days this seems more pronounced.

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://go.nrelabs.io/syringe/exp/lesson. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).

The other main issue is that this uses the old /syringe path, which is another artifact of using an old version of antidote-web.

Once #28 is fixed, we should re-enable this and ensure no CORS issues remain.