blog: add PSI resource-contention post (draft)

[nitinware]

Add a draft blog post, 'Beyond CPU Utilization: Using PSI to Diagnose Kubernetes Resource Contention', as a page bundle with an SVG architecture diagram. Marked draft: true with no publication date.

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[kubernetes-prow]

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[lmktfy]

Hi. This is marked draft in two ways.

• draft: true is correct; it signifies that after this merges, there is a separate step before publication
• The pull request itself is marked as a work in progress. That signifies that you do not want it reviewed until your work is complete.

If you want this PR to be reviewed, say so (and also click the Mark as ready button in the GitHub web UI).

Sorry that these can be confusing