Hide sex legend by default and improve point scaling

[smasongarrison]

This pull request introduces several improvements to the ggpedigree package, focusing on enhancing plot configuration flexibility, improving default visualization options, and refining the demonstration and testing of these features. The main changes include making the sex legend hidden by default, implementing dynamic scaling of point sizes based on pedigree size, and updating documentation and tests accordingly.

Plot configuration and visualization improvements:

• The sex legend (Sex key) is now hidden by default in ggpedigree, making plots less cluttered unless explicitly requested. Associated logic in plot construction ensures the legend and label are only shown when desired. [1] [2] [3] [4] [5]
• Point size in plots now automatically scales as a function of pedigree size, with different scaling factors for small, medium, and large pedigrees, improving readability across datasets of varying sizes. [1] [2] [3]

Documentation and demonstration updates:

• The Game of Thrones dataset vignette was updated with tweaks to improve visualization, including changes to point_size, label inclusion, and example configurations for better clarity in demonstrations. [1] [2] [3] [4] [5] [6] [7] [8] [9]

Testing and code maintenance:

• Expanded and refactored tests for plot configuration, especially around point scaling by pedigree size, ensuring correct behavior for various input scenarios. [1] [2]
• Minor code maintenance in data preparation scripts, such as commenting out unnecessary CSV writes. [1] [2] [3]

These changes collectively improve the usability and visual quality of pedigree plots, while ensuring robust configuration and clear documentation for users.

[smasongarrison]

#94