message: Update theme switcher in docs
diff: @@ -5,14 +5,14 @@ import React from 'react'
  // We'll replace this component when @primer/components has a first-class
  // API for theme switching.
  function ThemeSwitcher({children}) {
  - const [theme, setTheme] = React.useState('dark')
  + const [colorMode, setColorMode] = React.useState('day')
  React.useEffect(() => {
  function handleKeyDown(event) {
  // console.log('hi')
  // Use `ctrl + cmd + t` to toggle between light and dark mode
  if (event.key === 't' && event.ctrlKey && event.metaKey) {
  - setTheme(theme === 'light' ? 'dark' : 'light')
  + setColorMode(colorMode === 'day' ? 'night' : 'day')
  }
  }
  document.addEventListener('keydown', handleKeyDown)
  @@ -20,9 +20,9 @@ function ThemeSwitcher({children}) {
  return function cleanup() {
  document.removeEventListener('keydown', handleKeyDown)
  }
  - }, [theme])
  + }, [colorMode])
  - return <ThemeProvider initialColorScheme={theme}>{children}</ThemeProvider>
  + return <ThemeProvider colorMode={colorMode}>{children}</ThemeProvider>
  }
  // Users can shadow this file to wrap live previews.
  