feat: flex component, document higher-order layout components

Jacky Zhao

2025-03-11 2718ab90194b3c7be600d1a2dadc4250207db1c0

 quartz.layout.ts

@@ -25,8 +25,15 @@
  left: [
    Component.PageTitle(),
    Component.MobileOnly(Component.Spacer()),
    Component.Search(),
    Component.Darkmode(),
    Component.Flex({
      components: [
        {
          Component: Component.Search(),
          grow: true,
        },
        { Component: Component.Darkmode() },
      ],
    }),
    Component.Explorer(),
  ],
  right: [