[ENH] navbarPage

Navbar page as in shiny:

```r
navbarPage("App Title",
  tabPanel("Plot"),
  navbarMenu("More",
    tabPanel("Summary"),
    "----",
    "Section header",
    tabPanel("Table")
  )
)
```

maybe this will help: https://fomantic-ui.com/elements/container.html#/definition 