IVGCVSW-5605 Doxygen: Add contribution guide sections

 * Adds a page for contribution guidelines (Uses md guide)
 * Adds a section for contribution guides (Uses md guide)
 * Minor beautification

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Iafd7e3abf9da660ec21a215afada61a27ce928fc
diff --git a/docs/Doxyfile b/docs/Doxyfile
index 09ad232..a8a5b5c 100644
--- a/docs/Doxyfile
+++ b/docs/Doxyfile
@@ -819,7 +819,7 @@
                          ./docs/01_02_deserializer_serializer.dox \
                          ./docs/02_build_guides.dox \
                          ./docs/03_use_guides.dox \
-                         ./docs/04_backends.dox \
+                         ./docs/04_contributor.dox \
                          ./src/armnnQuantizer/README.md \
                          ./src/armnnConverter/README.md \
                          ./tests/ImageCSVFileGenerator/README.md \
@@ -828,13 +828,16 @@
                          ./python/pyarmnn/README.md \
                          ./include/ \
                          ./src/ \
+                         ./src/backends/README.md \
+                         ./src/dynamic/README.md \
                          ./tests/ \
                          ./delegate/include \
                          ./delegate/src/armnn_external_delegate.cpp \
                          ./delegate/BuildGuideNative.md \
                          ./delegate/IntegrateDelegateIntoPython.md \
                          ./README.md \
-                         ./docs/FAQ.md
+                         ./docs/FAQ.md \
+                         ./ContributorGuide.md
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses