Update examples

[alexey-koran]

Add usage examples:

• [ ] BaseIcon
• [ ] Adaptive Video component
• [ ] How to use template literal classnames with clsx & purgecss (to avoid it purge)
• [ ] Image lazyloading
• [ ] Dark/light theme
• [ ] i18en support
• [ ] .env
• [ ] Embla slider
• [ ] Tanstack router
• [ ] TanStack Table
• [ ] React hook form
• [ ] React hot toast
• [ ] React grid layout
• [ ] React data grid
• [ ] React flow
• [ ] Relay