Documentation: Adds sticky cookie note for k8s multiple replica setups

[robgonnella]

Proposed change

I recently encountered an issue in k8s that caused homepage to reload 3-5 times each time the window or tab was blurred then re-focused. The issue wound up going away when I reduced my homepage replica count to 1. I was able to resolve the issue, while still keeping my replica count at 2, by enabling sticky sessions for the homepage route. This PR aims to document this finding for anyone else that might be experiencing the same issue.

Related thread: #2305 (reply in thread)

Type of change

• New service widget
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation only
• Other (please explain)

Checklist:

• If applicable, I have added corresponding documentation changes.
• If applicable, I have reviewed the feature and / or service widget guidelines.
• I have checked that all code style checks pass using pre-commit hooks and linting checks.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.

[shamoon]

Thanks

[github-actions]

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