docs: move maintainers document

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I1c910d759036ba64e3e36c78a4af6728bb30f2c3
diff --git a/docs/index.rst b/docs/index.rst
index 99a1ffe..260c13f 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -5,6 +5,7 @@
    :maxdepth: 1
    :numbered:
 
+   about/index
    appendix
 
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