Football FOUC

[In relation to...](https://github.com/guardian/frontend/issues/3665).

After talking to @kaelig, duplication of sass seemed the only way to get around the massive FOUC we have with football.

To outline, our problem is:
* We have football tables & matches throughout the site, not just on FootB pages.
* We shouldn't include table & match SasS in the head of the whole site as it's only 10% of our users.
* We need it in the head for FootB pages as the FOUC is terrible, on slow connections, unusable (see screenshot).

We have decided to opt for duplication on the football pages and maintaining the cache / localstorage etc of the `global.css`.

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![DUPLICATION](http://stream1.gifsoup.com/view1/1131533/the-aswirl-twins-o.gif)