Lawvere theories and monads

In this Agda file, I give an introduction to Lawvere theories and Monads. It's not exactly a "gentle" introduction because:

  1. I'm still trying to grok these things myself,
  2. I've to live up to my reputation of writing unfathomable gagaposts.

We'll start with the State monad and, briefly, a Tick monad. The game is the following: I'll present them syntactically -- through a signature -- and semantically -- through a collection of equations. I'll then show how the usual monad is related to this presentation.

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