Put the Field Guide in the Library, too!

This frees up another location...the journal and achievements don't feel like traditional 'locations' either, though maybe they could be combined into a 'study' or something that features accolades/a trophy rack...I don't know, haha.

The issue names no files, tests, or entry points. First clarify whether the Field Guide should move into the Library and whether the journal and achievements should be combined; the work is done when the intended location and resulting game layout are agreed.

Written by the indexing model from the issue text.