Colour similarity

remove all those lines below + pygments/ipython css and replacing it with

```scss
  // ipython stuff
  .prompt {
      display: none;
  }

  .output_png {
    width: 100%;
    text-align:center
  }

  .output_text {
    pre {
      padding: 0;
    }
  }
```

makes it consistent with the rest of the code samples