title: Go to another page of flexdashboard on click shiny actionbutton
body: <p>I have following code in my <code>test.Rmd</code>.</p>
  
  <pre><code>---
  title: "Test Application"
  runtime: shiny
  output: 
    flexdashboard::flex_dashboard:
      orientation: rows
      vertical_layout: fill
  ---
  
  sidebar {.sidebar}
  ==========================
  
  Controllers
  -----------------------
  ```{r}
  actionButton("clickMe", label = "Click Me", class = "btn btn-lg btn-primary")
  ```
  
  Page1
  ========================
  
  Page2
  =======================
  </code></pre>
  
  <p>Initially, my app is on Page 1. I want to take my app to Page2 on clicking the button <code>clickMe</code>. Please help me with this..!</p>