Delete Service Graph

[clyang82]

Signed-off-by: Chun Lin Yang clyang@cn.ibm.com

istio/istio#9066 - ServiceGraph is deprecated in 1.1 in favor of Kiali. Remove the document accordingly.

[istio-testing]

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[clyang82]

from this PR - #2715, just add a note for service graph deprecated. We don't want new users to discover and start using it. so propose to delete this staff. @geeknoid it is up to you. Thanks.

[geeknoid]

/lgtm
/approve

[istio-testing]

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This pull-request has been approved by: clyang82, geeknoid

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