Provide updated installation instructions for openSUSE/SLE (#1495)

[suntorytimed]

• openSUSE meanwhile includes kompose in their official repositories for Tumbleweed and Leap
• on SUSE Linux Enterprise Server kompose is available via PackageHub
• fixes #1495

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: suntorytimed / name: Stefan Weiberg (61725b1132ca899c3caf29a1c5e2fb6cd29ccf92)

[suntorytimed]

/assign @kadel

[suntorytimed]

I am contributing this as an individual contributor with my own signed CLA, but the company I work for (SUSE) has also already signed a corporate CNCF CLA.

[k8s-triage-robot]

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/lifecycle stale

[suntorytimed]

/remove-lifecycle stale

[kadel]

/approve /lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kadel, suntorytimed

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[kadel]

/override lint

[cdrage]

LGTM!

[suntorytimed]

Thanks for merging!