Renaming the specification to index.rst to follow colorado guidelines.

Change-Id: I0d8d12f923f3f925537be7fd32d118c4497802d5
Signed-off-by: ChristopherPrice <christopher.price@ericsson.com>
(cherry picked from commit 67fdf71aff84bfc1faed14cc8be4cb852adc0690)

diff --git a/docs/specification/pharosspec.rst b/docs/specification/index.rst
similarity index 100%
rename from docs/specification/pharosspec.rst
rename to docs/specification/index.rst