Update documentation

[waseem-polus]

• [x] Combine installation and getting started into one page
• [ ] Add introduction page with information on vision and goals of the library
• [ ] Document how components can be styled with tw, css classnames, and inline style prop
• [ ] Lucide icons are used in some components
• [ ] Remove un-refined/undocumented component pages
• [ ] Update greenhouse page
• [x] Remove spacing and colors sections since they're not used anymore
• [ ] Create ComponentExample that encapsulates Tab (blocked by #61)