654 citation field updates

[SonAndrea]

Modified the current implementation of citations:

1. Added a new preference to the settings menu to determine site-wide citation style for a given user (saves to local storage and defaults to APA).
2. For documents, citations now appear at the top of the existing footer with "how to cite this document" followed by its citation.
3. For documents, the edit metadata page no longer has the ability to select a citation style but not displays the correct citation based on the given style preference.
4. For collection pages, a main citation is generated at the bottom of the page.
5. For collection chapters, a citation for the given chapter is generated at the bottom of the page.

Key Note: I've added 4 new columns (publication_date & authors to collection_chapter and publication_date & editors to edited_collection). These citations now pull from these new columns and will need to be filled with data before use.

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