Wrap up guide

[tremho]

This wraps up the documentation guide. It removes the two unfinished (and beyond meaningful scope) sections meant to walk through migrating to actual hardware and for stepping through a process to build a virtual PC. Instead, the guide concludes with the final integration and outlines what steps a reader might take if they actually wanted to build such a virtual PC, and/or steps they should consider for moving ahead to any real-world goals.

This branch was made starting from the integration-complete branch (still in PR), so it contains all of the integration pages as part of it until that can be merged. This branch does modify the first and last pages of the integration section, however.