fix(REAME.md): Update manual install steps

[tolusha]

Signed-off-by: Anatolii Bazko abazko@redhat.com

What does this PR do?

Update manual install steps

What issues does this PR fix or reference?

eclipse-che/che#17823

How to test this PR?

Try to install chectl following the manual steps

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[openshift-merge-robot]

@tolusha: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/v4-chectl-e2e	0bb5a6d	link	/test v4-chectl-e2e
ci/prow/v5-chectl-e2e	0bb5a6d	link	/test v5-chectl-e2e

Full PR test history. Your PR dashboard.

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[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: AndrienkoAleksandr, mmorhun, tolusha
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[openshift-ci-robot]

New changes are detected. LGTM label has been removed.