Remove duplicate list entry in index.rst

[pappybuck]

Deleted a repeated bullet point.

Description of your changes:

Fixed a typo in the documentation where a bullet point was repeated.

Which issue is resolved by this Pull Request:
Resolves #

[scylla-operator-bot]

Hi @pappybuck. Thanks for your PR.

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[tnozicka]

/ok-to-test

[tnozicka]

/approve
/lgtm

[scylla-operator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pappybuck, tnozicka

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