Remove Foundation classes from USFS when USWDS 2.0 is released

[annekainicUSDS]

Now that new version of USWDS will soon include more grid support, go back through and remove Foundation classes.

[jcmeloni-usds]

This will be amazing.

I think this should warrant a specific note in a "known issues" or "important upcoming changes" or some such for public consumption -- what do you think @ju-liem ?

[jcmeloni-usds]

@ju-liem Let's ensure that the current state of this is documented in the wiki as a known issue/dependency that we're prioritizing removing as soon as we can -- and if we know when that will be because USWDS tells us, let's include that! Might just ask them.

[annekainicUSDS]

This is blocked until USWDS releases version 2.0, because that will provide the grid support we need and currently import from Foundation.

[jcmeloni-usds]

@fatima-gov @annekainicUSDS Do either of you have the latest info on the status of the USWDS 2.0 branch? Tons of commits since the alpha branch was originally pushed out, but I haven't been on the USWDS calls to get the latest.

[annekainicUSDS]

@jcmeloni-usds I don't have any more updated information, last I heard it was still being worked out, but I haven't heard a release date yet.

[jcmeloni-usds]

Ok thanks!

[jcmeloni-usds]

Let's not forget this!

[dmethvin-gov]

This is most likely to occur as part of #66, since it would be a breaking change for anyone using the library currently.