Handle / & /wiki & /wiki/ URLs

https://wikia-inc.atlassian.net/browse/HG-438

Don't push to Mercury's production before this https://github.com/Wikia/app/pull/5668 is not on app's production.
oh sorry,

data has to be stringified in order to be printable by handlebars
as when you do
{{article.json}}

it will call on it `toString();`
and if it were plain object, it would becomes `[object Object]`

we might add Handlebars helper `json` to do that for us, but clean up the data that we pass around, that sounds good to me as well