CPBR-2163: removing template files that are moved to docker image repo

[rahejaprince]

Description

Removing the template files as they are now being migrated to docker image repo to make it consistent with other docker image repos. PR to make this change - confluentinc/ksql-images#208.

Testing done

NA

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")
• Do these changes have compatibility implications for rollback? If so, ensure that the ksql command version is bumped.

[confluent-cla-assistant]

🎉 All Contributor License Agreements have been signed. Ready to merge.
_{Please push an empty commit if you would like to re-run the checks to verify CLA status for all contributors.}