doc: Reorganise images and update links

Change-Id: I679d1499376a524bef1cfc33df995b0a719b5ac8
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
diff --git a/docs/components/exception-handling.rst b/docs/components/exception-handling.rst
index a89a05c..30600f9 100644
--- a/docs/components/exception-handling.rst
+++ b/docs/components/exception-handling.rst
@@ -107,7 +107,7 @@
 
 .. _ehf-figure:
 
-.. image:: ../draw.io/ehf.svg
+.. image:: ../resources/diagrams/draw.io/ehf.svg
 
 A priority level is *active* when a handler at that priority level is currently
 executing in EL3, or has delegated the execution to a lower EL. For interrupts,