Add more "real-world" content to tutorial pages

[jonnew]

For instance, in the breakout board tuturial add images and content that indicates to the user how the breakout board is supposed to behave if it's functioning correctly. Here are some examples:

• Screenshots showing visualizers (in a section like "Memory monitor"?)
• GIFs that demonstrate the workflow/Onix system responding to or enacting visual changes in "the real world". For instance, if a workflow does something in response to a user setting a digital input HIGH, the user's action + the workflow's response can be shown in a GIF. Or similarly, if Bonsai is controlling the state of an LED, that can be shown in a GIF.

Originally posted by @cjsha in #39 (comment)

[jonnew]

To be concrete, I will start with the breakout board tutorial. Then the other tutorial issues can follow using this example.