🎨 Reorganize the components and theme creation API

[BattleCh1cken]

Summary

Closes #44 and #28.

Checklist

• [x] I have fully tested all of the added features
• [x] I have fully documented all of the relevant code
  • [x] Document all of the components
  • [x] Update the theme implementation docs
• [x] rules constructor
• [x] various component constructors
  • [x] decision-matrix
  • [x] admonitions
  • [x] plot
  • [x] pie-chart
• [x] finish porting radial and linear to the new constructors
• [x] unify theme's handling of the type parameter

Additional Notes

[BattleCh1cken]

Currently the documentation is still incomplete but I'm opening this up for review because I'm interested to know what you guys think.