[#1810] Adding a Learn More section to the console introduction

This introduces the idea of having short "intro" chapters for each component, followed by lots of related docs. This is a model that we largely want to follow in the components and in the framework book itself (we also need more in-context cross-linking between documents).

I've also updated a few document titles to be more descriptive.

Author: weaverryan

components/console/introduction.rst

@@ -401,3 +401,9 @@ returns the returned code from the command (return value from command's
     something and display feedback to the user. So, instead of calling a
     command from the Web, refactor your code and move the logic to a new
     class.
+
+Learn More!
+-----------
+
+* :doc:`/components/console/usage`
+* :doc:`/components/console/single_command_tool`

components/console/single_command_tool.rst

@@ -1,8 +1,8 @@
 .. index::
    single: Console; Single command application
 
-How to build an Application with a single Command
-=================================================
+How to build an Application that is a single Command
+====================================================
 
 When building a command line tool, you may not need to provide several commands.
 In such case, having to pass the command name each time is tedious. Fortunately,

components/console/usage.rst

@@ -1,8 +1,8 @@
 .. index::
     single: Console; Usage
 
-Console Usage
-=============
+Using Console Commands, Shortcuts and Built-in Commands
+=======================================================
 
 In addition to the options you specify for your commands, there are some
 built-in options as well as a couple of built-in commands for the console component.