Intro text

[mishmosh]

I think intro text would help make this even better as a standalone learning experience, in 2 areas:

1. What does this thing do?

It could take a few forms. In order of my personal preference:

• small section that's visible by default, and doesn't impede usage of visualizer, but can be dismissed via click or scroll
• in the header, always visible
• triggered by a help or about link
• splash screen upon first load

Here's a first pass of the text, interested in comments!

"DAGs (directed acyclic graphics) are the core data structure of IPFS. They enable efficient data verification and management. Upload a file, then click menu options to explore the different ways that file can be split up into chunks."

2. What do these things mean?

The menu options might also benefit from some description. Example below: