The way that we were doing it before was going to
make it very difficult to implement any sort of
error handling or extension to the language.

Because I was assuming that every expression
started with a literal, calls to `each` were
getting wrapped by a functionCall node with no
functionName, which was subsequently ignored by
the compiler. This removes all of that uselessness

No variables or conditionals or anything yet, just
the basic ability to turn s-expressions into HTML.