Rough in of NUX Guide steps

Summary: Ref T11132. Will work on CSS tomorrow, but wanted to rough in the UI Steps to get guidance. Not sure what you have in mind for the "app" part, if you want to explain it and I build or you build.

Test Plan: Visit each page and click on links. Very rough and unfinished.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T11132

Differential Revision: https://secure.phabricator.com/D16419