Merge changes from topic "sphinx-doc"

* changes:
  doc: Update link formats
  doc: Update page content after re-arrangement
  doc: Sync common content with TF-A
  doc: Move content from Porting Guide
  doc: Migrate content from User Guide and update it
  doc: Move tools info to Getting Started chapter
  doc: Move content to new About chapter
  doc: Copy readme content to docs/index.rst
diff --git a/Makefile b/Makefile
index dc6092f..f5f1c3f 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 
 # TFTF Version
 VERSION_MAJOR		:= 2
-VERSION_MINOR		:= 2
+VERSION_MINOR		:= 3
 
 ################################################################################
 # Default values for build configurations, and their dependencies