Improves formatting for RTD, adds more tutorial

HELP.md

@@ -207,6 +207,19 @@ Although the imperative approach is a fundamentally ugly method, Python does a s
 
 ### Recursive Method
 
+Recursion is one of the most fundamental tools of functional programming, and is thus a place where Coconut can really help clear up confusing code. Here's the recursive approach in pure Python:
+
+```python
+def factorial(n):
+    """Compute n! where n is an integer >= 0."""
+    if n == 0:
+        return 1
+    elif isinstance(n, int) and n > 0:
+        return n * factorial(n-1)
+    else:
+        raise TypeError("the argument to factorial must be an integer >= 0")
+```
+
 ```python
 def factorial(n):
     """Compute n! where n is an integer >= 0."""
@@ -219,6 +232,19 @@ def factorial(n):
         raise TypeError("the argument to factorial must be an integer >= 0")
 ```
 
+```python
+@recursive
+def factorial(n, acc=1):
+    """Compute n! where n is an integer >= 0."""
+    case n:
+        match 0:
+            return acc
+        match n is int if n > 0:
+            return factorial(n-1, acc*n)
+    else:
+        raise TypeError("the argument to factorial must be an integer >= 0")
+```
+
 ### Iterative Method
 
 ```python

README.rst

@@ -1,6 +1,12 @@
 Coconut
 =======
 
+.. toctree::
+   :maxdepth: 3
+
+   HELP
+   DOCS
+
 Coconut_ is a variant of Python_ built for **simple, elegant, Pythonic functional programming**.
 
 Coconut is hosted on PyPI_, where it has been downloaded `over 20,000 times <http://pypi-ranking.info/module/coconut>`_. Installing Coconut is as easy as:
@@ -22,12 +28,6 @@ Coconut is completely open-source, and new contributors are always welcome. Cont
 .. _Docs: http://coconut.readthedocs.org/en/master/DOCS.html
 .. _GitHub: https://github.com/evhub/coconut
 
-.. toctree::
-   :maxdepth: 3
-
-   HELP
-   DOCS
-
 Coconut in Action
 -----------------