fix: Add clickhouse tuning steps

[vvnginx]

Troubleshooting steps for clickhouse running out of memory

Proposed changes

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[travisamartin]

This update feels more like configuration and tuning guidance rather than tech spec material. The tech spec guide should stay concise, while detailed instructions like these would be a better fit in the ClickHouse configuration guide:

https://docs.nginx.com/nginx-instance-manager/system-configuration/configure-clickhouse/

Maybe we can move most of this content there, and then leave a short note in the tech spec guide that simply points users to the configuration guide for tuning details.

[vvnginx]

This update feels more like configuration and tuning guidance rather than tech spec material. The tech spec guide should stay concise, while detailed instructions like these would be a better fit in the ClickHouse configuration guide:

https://docs.nginx.com/nginx-instance-manager/system-configuration/configure-clickhouse/

Maybe we can move most of this content there, and then leave a short note in the tech spec guide that simply points users to the configuration guide for tuning details.

Nice suggestion... incorporated it