Rethink how site map is generated

[davidsmejia]

We are receiving API errors on deploys when creating sitemaps.

I think if we can figure out how to remove _app's getIntialProps we should be able to implement something that generates the scaffolding for the sitemaps on deploys but queries the urls for the 1k experiments per page at time of request.

Error:

14:26:07.773 | Fetching experiments from http://api.refine.bio/v1/search/?limit=1000&offset=13000&ordering=id
-- | --
14:26:08.211 | Encountered error Error: Request failed with status code 500