Update the graph path in Readme and update project number in doxyfile

* Move all the image files used in doxygen to docs/
* Have a single path for all images in Doxyfile
* Update project number to 21.11 in Doxyfile

Signed-off-by: Nikhil Raj <nikhil.raj@arm.com>
Change-Id: Ic9102d36b69a8261caf8e55da645463540e0b9f3
diff --git a/docs/Doxyfile b/docs/Doxyfile
index 43fd269..7dd51b5 100644
--- a/docs/Doxyfile
+++ b/docs/Doxyfile
@@ -61,7 +61,7 @@
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 21.08
+PROJECT_NUMBER         = 21.11
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
@@ -978,7 +978,7 @@
 # that contain images that are to be included in the documentation (see the
 # \image command).
 
-IMAGE_PATH             = python/pyarmnn/
+IMAGE_PATH             = docs/
 
 # The INPUT_FILTER tag can be used to specify a program that doxygen should
 # invoke to filter for each input file. Doxygen will invoke the filter program