add Kriptonio pinning service

[gitkonio]

Describe your changes

PR adds Kriptonio pinning service to persistence.md document. Kriptonio is a Web3 development platform that offers IPFS pinning service.

Files changed

• docs/concepts/persistence.md

What issue(s) does this address?

Add new pinning service

Does this update depend on any other PRs?

No

Checklist before requesting a review

• [x] Passing the beta version of the Check Markdown links for modified files check. Action results can be viewed here.

Checklist before merging

• [x] Passing all required checks (The beta Check Markdown links for modified files check is not required)

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