Drop unused examples and scripts

[rzetelskik]

Description of your changes: To minimise the number of manifests and scripts we have to keep unified (such as in #2049) and up to date, we should drop the unused scripts and examples. This PR drops the deployment scripts and examples earlier used in our docs, which became obsolete with the recent changes.

Which issue is resolved by this Pull Request:
Resolves #

/kind cleanup
/priority important-longterm

[tnozicka]

/approve
(lgtm)

/assign @zimnx

[rzetelskik]

/test images
/retest

[zimnx]

/lgtm

[scylla-operator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rzetelskik, tnozicka, zimnx

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[rzetelskik]

@rzetelskik: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
ci/prow/e2e-gke-parallel aa98152 link true /test e2e-gke-parallel
Full PR test history. Your PR dashboard.

related to #2274 (comment)
/retest