Fix Slack badge link in README.md

[Ishan-AI-coder]

The Slack badge in README.md was not clickable because the link destination had a duplicated opening parenthesis:

]((https://www.kubeflow.org/docs/about/community/#kubeflow-slack-channels))

This caused the URL to be parsed incorrectly (including the stray parentheses), breaking the hyperlink so the badge displayed as a plain image instead of a link.

Fix: remove the extra parenthesis so the badge correctly links to the Kubeflow Slack channels page.

[![Slack](...)](https://www.kubeflow.org/docs/about/community/#kubeflow-slack-channels)

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[google-oss-prow]

Hi @Ishan-AI-coder. Thanks for your PR.

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[juliusvonkohout]

/lgtm
/approve

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