build: Update Security example to 3.1.0 released images.

[lenny-goodell]

Removed obsolte compose files and fixed doc link in README.

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PR Checklist

Please check if your PR fulfills the following requirements:

• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)

Testing Instructions

[bnevis-i]

Removed obsolte compose files and fixed doc link in README.

Would you be open to publishing a large context diff instead? I wanted to show what the specific changes where to enable this functionality.

[lenny-goodell]

Would you be open to publishing a large context diff instead?

Not following what you are looking for?

[jim-wang-intel]

LGTM

[bnevis-i]

Would you be open to publishing a large context diff instead?

Not following what you are looking for?

diff -c 10 original-docker-compose.yaml new-docker-compose.yaml > docker-compose.diff

and check in docker-compose.diff

The idea is to show people how to recreate the supplied docker-compose.

[lenny-goodell]

The idea is to show people how to recreate the supplied docker-compose.

As part of the tutorial? Not sure the value and it is out of scope for this PR.

[bnevis-i]

Waive review.