This is a major new releast and reworking of thimble for a modern approach to variables.
- moved all overrides to CSS variables
- added optional buttons module
- added optional utilities module
- added optional forms module
- moved breakpoints to config file
- updated colors
- added color helper for light/dark variation
- added built in light/dark mode
- added new container classes
- fixed incorrectly named header classes
- removed outdated video container and added ratio helper classes