Feature/48 create new items abilities natures

[AkeemAllen]

Users are now able to create new items, abilities, and natures. They'll also be able to delete those and any other existing records.

https://github.com/AkeemAllen/WikiGen/assets/32404761/1e70147e-1601-41ca-a665-15d78524d807

Smaller Cosmetics tweaks

• Removed AppBAr header
• Tweaked default window size so it could be wider