New-apps - #8

- Introduced a comprehensive design system and UX approach documentation, detailing color palettes, typography, spacing, and component guidelines.
- Implemented a CSS variable system for consistent styling across the application, enhancing maintainability and scalability.
- Updated various components (Auth, Boards, Journal, Lists, Notes) to utilize the new design system, ensuring a cohesive look and feel throughout the app.

- Created a new UX guidelines document to standardize design patterns across Cryptd applications, including button consistency, naming conventions, and archive functionality.
- Enhanced the Boards, Journal, and Lists components to support archiving of columns, entries, and items, respectively.
- Updated UI elements to reflect archived states with appropriate styling and badges.
- Implemented a "Show archived" filter in the Journal component to manage visibility of archived items.