Add Idena case study

[midenaio]

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[midenaio]

@johnnymatthews we have added the Idena<>IPFS case study:

https://bafybeigfanyd2c2qg7i7yu5rfk63wbhjctw5q5gn43ew3pilnz77lba2mq.on.fleek.co/concepts/case-study-idena/#the-story

Could you review?

[midenaio]

Hi @guseggert, could you review the PR?

[ElPaisano]

closing because this was marked as kind\stale. If you would like to have Idena added as a case study, please re-open this PR, or create a new PR.