Add Calamari Image Volume docs page

[APErebus]

Adds a documentation page for the Calamari Image Volume feature of the Kubernetes agent.

Related to MD-2016

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AI Disclaimer: Initially written by Claude and I rewrote chunks of it.

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[steve-fenton-octopus]

There's one small improvement you could make, such is that multiple links have the same text, which means a user navigating these audibly will just hear "DockerHub" many times over.

If you update them to be unique, they would be more helpful, like "octopus.calamari on DockerHub".

[APErebus]

There's one small improvement you could make, such is that multiple links have the same text, which means a user navigating these audibly will just hear "DockerHub" many times over.

If you update them to be unique, they would be more helpful, like "octopus.calamari on DockerHub".

Ah, interesting. I'll take a look