Adding SuperTuxKart to the examples page

[markmandel]

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[markmandel]

/cc @roberthbailey for visibility

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[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: markmandel, roberthbailey

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[agones-bot]

Build Succeeded 👏

Build Id: e187acf1-afc0-4f89-b032-83f08bda2f36

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.4.0-2df4e79
• image: gcr.io/agones-images/agones-sdk:1.4.0-2df4e79
• image: gcr.io/agones-images/agones-ping:1.4.0-2df4e79
• Linux C++ SDK (build): agonessdk-1.4.0-2df4e79-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.4.0-2df4e79.zip

A preview of the website (the last 30 builds are retained):

• https://2df4e79-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1336/head:pr_1336 && git checkout pr_1336
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.4.0-2df4e79