Use /standard/ and /guidance/ for pages

[Narlotl]

The pages are under the base domain, which isn't helpful in understanding what they are from the URL. Guidance pages should be under /guidance/ and standards should be under /standard/

[lukefretwell]

This will cause a cascading impact across all the sites and search indexes. If we do this, we'll need to update the json files, but also search/replace across sites where it's hard-coded.

Is this important, really worth the effort?