First try on Intro to Web Apps

I'm happy with the level at which I have written this now (after a whole lot of waffling between Is this simple enough? or Is this too simple?). But in simplifying, I feel like there are some things that might be outright false. For example,

"The browser is the client, or user interface, to the web app where users interact with it. The server does the heavy lifting."

So any guidance on that would be appreciated. 

I would really, really like to not add much more to this section because I really want to focus on the Clojure fundamentals and just have enough here to enable make the app a web app.