stephchia/bird-morphology-tda: Revised code and data archive

This release contains an updated version of the code and data archive for the manuscript "Birds that don't exist: niche pre-emption as a constraint on morphological evolution in the Passeroidea," following feedback from the data editor.

Updates include:

• Expanded README with additional documentation on scripts and data metadata
• Minor technical fixes to improve code organization and reproducibility
• Additional code used for generating a figure added during manuscript revision
• Additional raw data included for figure generation