docs(README): add instruction for manual sync

[ixxeL2097]

Description of the change

Benefits

Possible drawbacks

Applicable issues

• fixes #

Additional information

Checklist

• Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• Variables are documented in the values.yaml and added to the README.md
• Title of the pull request follows this pattern [<name_of_the_chart>] Descriptive title

[linear]

ENT-3334 Sync fork with community charts

[github-actions]

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