Remove text version of headings for fwg. This is now contained in the

Original commit message from CVS:
Remove text version of headings for fwg.  This is now contained in the
SGML

docs/random/filter-writers-guide

@@ -1,57 +0,0 @@
-GStreamer Filter Writer's Guide
-===============================
-
-Outline:
-
-Basic concepts
-	Chain vs loop elements
-	Scheduling
-	Buffers
-	Typing and Properties
-	Metadata
-Building our first filter
-	Constructing the boilerplate
-		Doing it the easy way with FilterFactory
-		  (NOTE: FilterFactory doesn't exist yet)
-		Doing it the hard way with G[tk]Object
-	An identity filter
-		Building an object with pads
-		Attaching functions
-		The chain function
-	The plugin_init function
-		Registering the types
-		Registering the filter
-Building a simple test application
-	Initialization
-	Instantiating the plugins
-	  (NOTE: we really should have a debugging Sink)
-	Connecting them
-	Running the pipeline
-Loop-based Elements
-	How scheduling works, aka pushing and pulling
-	How a loopfunc works, aka pulling and pushing
-	Adding a second output
-		Identity is now a tee
-		Modifying the test application
-Types and Properties
-	Building a simple format for testing
-	A simple MIME type
-	Type properties
-	Typefind functions and autopluggin
-Buffers and Metadata
-	Anatomy of a Buffer
-	Refcounts and mutability
-	Metadata
-		How Properties work efficiently
-		Metadata mutability
-		  (FIXME: this is an unsolved problem)
-Sources and Sinks
-	Writing a source
-		Pull vs loop based
-		Region pulling
-		  (NOTE: somewhere explain how filters use this)
-	Writing a sink
-		Gee, that was easy
-State management
-	What are states?
-	Mangaging filter state