doc: Reorganise images and update links

Change-Id: I679d1499376a524bef1cfc33df995b0a719b5ac8
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
diff --git a/docs/components/ras.rst b/docs/components/ras.rst
index 9d56e63..137c0c3 100644
--- a/docs/components/ras.rst
+++ b/docs/components/ras.rst
@@ -39,7 +39,7 @@
 
 .. _ras-figure:
 
-.. image:: ../draw.io/ras.svg
+.. image:: ../resources/diagrams/draw.io/ras.svg
 
 See more on `Engaging the RAS framework`_.