Add documentation for Model Serving

[javierdlrm]

No description provided.

[jimdowling]

Looks good. I was mostly confused about model serving vs deployment vs model serving infrastructure. I think you were consistent, so you might want to ignore a few of the suggestions at the beginning of my review with changing model serving to deployments.

[robzor92]

In general there are a few broken links, especially in the model registry part which I think happened after the refactoring of the structure. Also the API reference is missing information about creation. We should follow a similar structure as https://docs.hopsworks.ai/hopsworks-api/2.6.0-SNAPSHOT/generated/api/jobs/ when it comes to creating an object like a deployment. So first a "Handle" section to get the ModelServing object, and then a "Creation" section for what operation is done to create a deployment. So model.deploy() or ms.create_deployment()