Hide "Add body text to parts" setting and related UI
NCBI has confirmed that the feature of Adding text to a part (see #701 (closed)) won't be developed for the initial release.
- hide the chapter-processed book setting "Add body text to parts" (in templates, new book and book settings UIs)
- result: body text editor is not available to users on "add part" modal and "part" page
Part page: