Fill in data for each step in the process

[shawon-crosen]

Write out the explanations for each step in the expungement process. Documentation of the process can be found here: https://docs.google.com/document/d/1k1rMepmTuitQGhJRTYo90jgaCXazj7RT801871MmOFo/edit

Keep the explanation as simple and concise as possible so it is as accessible as possible.

[pubby]

This has largely been completed. Editing and such will continue.