[Bug] Duplicate book abbreviations

[ParkerRobb]

Both Jeremiah and the LXX Letter of Jeremiah use the abbreviation Jr for the filename. LXX Jr.md refers to the Letter of Jeremiah; the prophet Jeremiah is missing a book MOC file.

I also suggest coming up with standard book abbreviations that do not overlap. I'm currently trying to replace your abbreviations with my own, but it's a pain trying to fix things when find and replace screws up because Phm contains Ph, for example. And Ab and Si are common Latin words contained in the Vulgate.

[ParkerRobb]

This issue is duplicated at AnthropologieBiblique/ObsidianTheologicalStudies#3

[ParkerRobb]

In particular, I would also better distinguish between Ezra-Nehemiah and 1 Esdras. Both of them are labeled as "Esdras A'" in LXX and the chapter files share the same book folder. Ezra-Nehemiah should be labeled "Esdras B'".