docs(readme): Update for Zsh configuration file break up

WIP: #10

README.md

@@ -33,13 +33,42 @@ There's a few special files in the hierarchy.
 
 - **bin/**: Anything in `bin/` will get added to your `$PATH` and be made
   available everywhere.
-- **Brewfile**: This is a list of applications for [Homebrew Cask](http://caskroom.io) to install: things like Chrome and 1Password and Adium and stuff. Might want to edit this file before running any initial setup.
-- **topic/\*.zsh**: Any files ending in `.zsh` get loaded into your
-  environment.
-- **topic/path.zsh**: Any file named `path.zsh` is loaded first and is
-  expected to setup `$PATH` or similar.
-- **topic/completion.zsh**: Any file named `completion.zsh` is loaded
-  last and is expected to setup autocomplete.
+- **Brewfile**: This is a list of applications for
+  [Homebrew Cask](http://caskroom.io) to install: things like Chrome and
+  1Password and Adium and stuff. Might want to edit this file before
+  running any initial setup.
+- **topic/\*.zsh**: configuration files
+    - Environment configuration (i.e., `.zshenv`)
+        - **topic/\*path.zsh**: Any file ending with `path.zsh` (except
+          those ending with `fpath.zsh`) is loaded first and is expected
+          to setup `$PATH` or similar.
+        - **topic/\*env.zsh**: Any file ending with `env.zsh` is loaded
+          second and is expected to setup any additional environment
+          (e.g., shell options).
+    - Interactive configuration (i.e., `.zshrc`)
+        - **topic/\*fpath.zsh**: Any file ending with `fpath.zsh` is
+          loaded for interactive shells only.  They are expected to
+          populate `$fpath`.
+        - **topic/\*.zsh**: Any files ending in `.zsh` (except those
+          specified elsewhere) are loaded for interactive shells only.
+          Interactive configuration can include aliases, color output,
+          prompt configuration, or anything else that should only be
+          loaded when a user is interacting with Zsh.
+        - **topic/\*completion.zsh**: Any file ending with
+          `completion.zsh` is loaded last for interactive shells only.
+          They are expected to setup autocomplete.
+    - Login configuration (i.e., `.zprofile`, `.zlogin`, `.zlogout`)
+        - **topic/\*profile.zsh**: Any file ending with `profile.zsh` is
+          loaded for login shells only.  Unlike `.zlogin`, these files
+          are loaded before the interactive files above are loaded.
+        - **topic/\*login.zsh**: Any file ending in `login.zsh` is
+          loaded for login shells only.  Unlike `.zprofile`, they are
+          loaded after your interactive files are loaded above.  This is
+          the ideal place to put anything you want to see when you start
+          up a new login shell (e.g., cowsay, date, todo, fortune).
+        - **topic/\*logout.zsh**: Any file ending in `logout.zsh` is
+          loaded for login shells only and only when you exit/logout the
+          shell.
 - **topic/\*.symlink**: Any files ending in `*.symlink` get symlinked into
   your `$HOME`. This is so you can keep all of those versioned in your dotfiles
   but still keep those autoloaded files in your home directory. These get